help please i dont understand

Therefore , the solution of the given problem of percentage comes out to be 38 years old is the median age.

In statistics, a "a%" is a figure or statistic that is expressed as a percentage of 100. The words "pct," "pct," but instead "pc" are also not frequently used. However, the sign "%" is frequently used to represent it. The percentage sum is flat; there are no dimensions. Percentages are truly integers because their numerator almost always equals 100. Either the % symbol (%) or the additional term "fraction" must come before a number to denote that it is a percentage.

Here,

The following algorithm must be used to determine the mean age:

=> mean = (all years added together) / (total number of persons)

The representative age for each age group is the age that falls in the middle of the range. With this approach, we can determine the total age as follows:

=>18(9) + 23(28) + 28(33) + 33(90) + 38(122) + 56(48) + 48(24) + 76(20) + 1089(0.25)

=> 162 + 644 + 924 + 2970 + 4636 + 2688 + 1152 + 1520 + 272.25

=>18(9) + 23(28) + 28(33) + 33(90) + 38(122) + 56(48) + 48(24) + 76(20) + 1089(0.25)

According to the information provided, there are 460 people in total.

=> mean = 17745.25 / 460

=> mean = 17745.25 / 460

As a result, the average lifespan is roughly 38.552 years.

The age category in this instance with the highest frequency has a midpoint of 38 and a frequency of 122. As a result, 38 years old is the median age.

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The roots of the quadratic equation 0 = 2x² + 12x-14 is (C) x=-7 and x=1.

Any equation in algebra that can be written in the standard form where x stands for an unknown value and a, b, and c stand for known values is said to be a quadratic equation.

In general, it is assumed that a > 0; equations with a = 0 are regarded as degenerate since they become linear or even simpler.

So, the roots of 0 = 2x² + 12x-14 are:

2x² + 12x-14  = 0

2x² + 14x - 2x -14

2x(x + 7) - 2(x + 7)

(2x - 2) (x + 7)

Now, use the zero product property as follows:

2x - 2 = 0

2x = 2

x = 2/2

x = 1

And

x + 7 = 0

x = -7

Therefore, the roots of the quadratic equation 0 = 2x² + 12x-14 is (C) x = -7 and x = 1.

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Correct question:

What are the roots of the quadratic equation 0 = 2x² + 12x-14?

a. 1,6, -7

b. 2,12,-14

c. -7,1

d. -1,7

For the following function, we have that:

In a graph:

Hence, for the graph in this problem, we have that:

Hence:

We have to look at the values of y on the interval, hence:

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Answer:

97.5% of the students passed this test.

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

Approximately 68% of the measures are within 1 standard deviation of the mean.

Approximately 95% of the measures are within 2 standard deviations of the mean.

Approximately 99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean of 78, standard deviation of 9.

What percentage of the  students passed this test?

Above 60.

60 = 78 - 2*9

So 60 is two standard deviations below the mean.

The normal distribution is symmetric, which means that 50% of the measures are above the mean and 50% are below.

Of the 50% above, all passed.

Of the 50% below, 95%(within 2 standard deviations of the mean) passed.

So

\(p = 0.5 + 0.5*0.95 = 0.975\)

97.5% of the students passed this test.

Answer:

Step-by-step explanation:

Answer:

Ok, so:

-The number of people who like tea are represented in the first column.

-The number of people who dislike tea are represented in the second column.

-The number of people who like coffee are represented in the first row.  

-The number of people who dislike coffee are represented in the second row.

This works like a multiplication chart:

People who like tea and coffee are represented in the top left square. People who dislike tea and coffee are represented in the box that coordinates to T' and C' (If you find T' and C' and run your fingers along the column/row until they run into each other, you'll find it.) The same is true for other combinations.

At the bottom of the first column is the total number of people who like tea. At the right-most part of the first row, is the total number of people who like coffee.

(52 people like tea, 80 people were surveyed)

I hope this helps you understand, please ask any clarifying questions you need! : )

Answer:

Don't cheat, there is your answer.

Step-by-step explanation:

Answer:

Step-by-step explanation:

42.6 divided by 0.07 is 608.571428

Regular division.

Answer:

the answer is 4 i believe

Step-by-step explanation:

The sampling distribution of the sample mean is a normal distribution with a mean of 2.3 crimes per day and a standard deviation of 0.2 crimes per day centered around population mean.

This distribution is centered around the population mean, and its standard deviation is much smaller than the population standard deviation, indicating that the sample mean is a more reliable measure of the population mean than individual observations.

1. The number of violent crimes committed in a day possesses a distribution with a mean of 2.3 crimes per day and a standard deviation of 2 crimes per day.

2. A random sample of 100 days was observed, and the mean number of crimes for the sample was calculated.

3. The sampling distribution of the sample mean is a normal distribution with a mean of 2.3 crimes per day and a standard deviation of 0.2 crimes per day.

4. This distribution is centered around the population mean, and its standard deviation is much smaller than the population standard deviation, indicating that the sample mean is a more reliable measure of the population mean than individual observations.

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Answer:

0

Step-by-step explanation:

\(\frac{y_{2}-y_{1} }{x_{2} -x_{1} } = \frac{-4-(-4)}{0-2} = \frac{0}{-2} = 0\)

Answer:

\(p(t) = \frac{9t^{3} + 729t - 1}{e^{t}(t^{2} + 81) }\)

g(t) = 0

And

The differential equation \(9ty + e^{t}y' = \frac{y}{t^{2} + 81 }\) is  linear and homogeneous

Step-by-step explanation:

Given that,

The differential equation is -

\(9ty + e^{t}y' = \frac{y}{t^{2} + 81 }\)

\(e^{t}y' + (9t - \frac{1}{t^{2} + 81 } )y = 0\\e^{t}y' + (\frac{9t(t^{2} + 81 ) - 1}{t^{2} + 81 } )y = 0\\e^{t}y' + (\frac{9t^{3} + 729t - 1}{t^{2} + 81 } )y = 0\\y' + [\frac{9t^{3} + 729t - 1}{e^{t}(t^{2} + 81) } ]y = 0\)

By comparing with y′+p(t)y=g(t), we get

\(p(t) = \frac{9t^{3} + 729t - 1}{e^{t}(t^{2} + 81) }\)

g(t) = 0

And

The differential equation \(9ty + e^{t}y' = \frac{y}{t^{2} + 81 }\) is  linear and homogeneous.

Answer:

It will be Fourth of July in 7 weeks.

Step-by-step explanation:

Since you know that there are seven days in a week, you can use a rule of three to find the amount of weeks in 49 days that is the number of days until Fourth of July:

 7 days    →    1 week

49 days    →        x

x=(49*1)/7

x=7

According to this, the answer is that it will be Fourth of July in 7 weeks.

Answer: If the fence is 4 1/6 yards long, we can first convert this to an improper fraction:

4 1/6 = (6*4 + 1)/6 = 25/6 yards

If Mrs. Ricks stops when she is 3/5 done, then she has painted:

(3/5)(25/6) = (325)/(5*6) = 15/2 = 7 1/2 yards

Therefore, Mrs. Ricks painted 7 1/2 yards of the fence.

Step-by-step explanation:

Answer:

I'm honestly proud of myself for getting this right, the answer is 123.2

Step-by-step explanation:

14 x 8.8 x 2 divides by 2 and that's your answer pretty self-explanatory and simple

Answer:

Step-by-step explanation:

D = 3,1

E = 1,-2

F= -4,2

Answer:

0.259

Step-by-step explanation:

There are some rules in determining what numbers are significant figures.

We can determine how many significant figures the number currently has.

There are currently seven significant figures. In order to round the number to three significant figures, we must round it to the thousandths place, or the 9.

The rounding rules are:

Since 0 is less than 5, the number rounded to 3 significant figures is 0.259.

One of the factors of the given quadratic expression is (x+2).

The given quadratic expression is:

\(6x^{2} +7x-10\)

Any expression of the form \(ax^{2} +bx+c\) is called a quadratic expression where a≠0.

Splitting the middle term of the given expression

\(6x^{2} +12x-5x-10\)

\(6x(x+2)-5(x+2)\)

\((x+2)(6x-5)\)

Hence, one of the factors of the given quadratic expression is (x+2).

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Answer:

Answer: 3) \(\sqrt{5}\)

Step-by-step explanation:

Radical Form and Exponent Form

A radical can be expressed as a rational exponent following the identity:

\(\displaystyle \sqrt[m]{x^n}=x^\frac{n}{m}\)

We should also recall that:

\((x^n)^m=x^{nm}\)

We are given the expression:

\(\displaystyle \left(5^{\frac{3}{4}}\right)^\frac{2}{3}\)

Applying the power of power:

\(\displaystyle \left(5^{\frac{3}{4}}\right)^\frac{2}{3}=\left(5^{\frac{3}{4}\cdot \frac{2}{3}}\right)\)

Simplifying:

\(\displaystyle \left(5^{\frac{3}{4}}\right)^\frac{2}{3}=5^{\frac{1}{2}}\)

Converting to radical form:

\(\displaystyle \left(5^{\frac{3}{4}}\right)^\frac{2}{3}=\sqrt{5}\)

Answer: 3) \(\sqrt{5}\)

Answer:

Option D is the correct answer

Step-by-step explanation:

Since, dimensions of both the matrices are different, hence they cannot be added.

Cone:

radius r = 4 inches

height h = 18 inches

volume = πr²h/3 = (3.14)(4²)(18)/3 ≈ 301.44 cm³

Cylinder:

r = 4 inches

h = 3 inches

volume = πr²h = (3.14)(4²)(3) = 904.32 cm³

Volume of cylinder is three times the volume of cone

Answer:

[x-3] [x+4]

Step-by-step explanation:

You look to see if you spot the appropriate factors strait away. If you can not immediately determine them you have to consider all of the potential ones and reason out which ones work.

Answer:

3 4/9-1 1/2= 1 17/18

Step-by-step explanation:

Answer:

3 4/9-1 1/2= 1 17/18

Step-by-step explanation:

Since the probability is less than 5%, which is the conventional threshold for unusual results, we can conclude that the time of 14.5 seconds is unusual for this school's 100 meter sprint. Therefore, the correct answer is D) −1.5; unusual.

To solve this question, we need to calculate the z-score using the formula:

z = (x - μ) / σ

Where x is the individual time, μ is the mean time, and σ is the standard deviation.

Substituting the given values, we get:

z = (14.5 - 17.6) / 2.1 = -1.48

Since the calculated z-score is negative, we need to refer to the standard normal distribution table to find the corresponding probability. Looking up the z-score -1.48 in the table, we find that the probability is 0.0694 or approximately 6.94%.

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Answer:

e would equal a half because it's in the middle

If Robert ate lunch at 11:am and he ate a snack 4and a half hours later, Robert ate his snack at 3:30 pm

To find out what time Robert ate his snack, we need to add 4 and a half hours to the time he ate lunch.

Since he ate lunch at 11:00 am, we can convert this time to 24-hour format by adding 12 hours to get 11:00 + 12:00 = 23:00.

Next, we add 4 and a half hours to 23:00 by converting the half hour to minutes and adding it to the minutes portion of the time:

23:00 + 4 hours + 30 minutes = 27:30

However, since there are only 24 hours in a day, we need to convert this time back to 12-hour format. To do this, we subtract 12 hours from 27:30 to get 15:30.

Therefore, Robert ate his snack at 3:30 pm (or 15:30 in 24-hour format).

In summary, we added 4 and a half hours to the time Robert ate lunch, converted the resulting time to 24-hour format, subtracted 12 hours to account for the excess of 24 hours, and then converted the time back to 12-hour format to obtain the time Robert ate his snack.

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The proportion of all novels that are between 50,000 and 60,000 words is approximately 0.

A. The random variable X, representing the number of words in a randomly selected romance novel, follows a normal distribution with a mean (μ) of 64,182 and a standard deviation (σ) of 17,154.

B. To find the proportion of all novels that are between 50,000 and 60,000 words, we need to calculate the area under the normal curve between those two values.

First, we need to standardize the values using the z-score formula:

z₁ = (50,000 - μ) / σ

z₂ = (60,000 - μ) / σ

Substituting the given values:

z₁ = (50,000 - 64,182) / 17,154

z₂ = (60,000 - 64,182) / 17,154

Calculating these z-scores will give us the standardized values.

Next, we need to find the corresponding cumulative probabilities for each z-score using a standard normal distribution table or a statistical calculator.

Let's assume we find P(Z < z1) = P(Z < z2) = p.

The proportion of all novels between 50,000 and 60,000 words is given by:

Proportion = P(z1 < Z < z2)

= P(Z < z2) - P(Z < z1)

= p - p

= 0

Since the probabilities are the same, the proportion of novels between 50,000 and 60,000 words is approximately 0.

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Answer:

Graph the solution set for the inequalityy > 2x - 5 by following these steps: Step 1: Identifythe slope and y-intercept. slope = y-intercept = -4. 2.

Step-by-step explanation: