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3 years ago

Urgent math help need will mark brainliest

Mathematics

1 answer:

Lelu [443]3 years ago

5 0

The far left column represents the 10's place and the digits to the right represent the 1's place.

look at the "3" row. How many digits are greater than 2? → 4,4,4,5,7 = 5 digits

How many digits are in the "4" row (representing ages in their 40's)? → 6 digits

How many digits are in the "5" row (representing ages in their 50's)? → 5 digits

How many digits are in the "6" row (representing ages in their 60's)? → 4 digits

How many digits are in the "7" row (representing ages in their 70's)? → 1 digit

How many customers are older than 32? 5 + 6 + 5 + 4 + 1 = 21

Answer: B

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Determine the sample size needed to construct a 90% confidence interval to estimate the population proportion when p = 0.65 and

WINSTONCH [101]

Answer:

n=170

Step-by-step explanation:

1) Notation and definitions

$n$ random sample taken (variable of interest)

$\hat p=0.65$ estimated proportion.

$p$ true population

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})$

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 90% of confidence, our significance level would be given by $\alpha=1-0.90=0.1$ and $\alpha/2 =0.05$ . And the critical value would be given by:

$z_{\alpha/2}=\pm 1.64$

The margin of error for the proportion interval is given by this formula:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

And on this case we have that $ME =\pm 0.06$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

And replacing into equation (b) the values from part a we got:

$n=\frac{0.65(1-0.65)}{(\frac{0.06}{1.64})^2}=169.968$

And rounded up we have that n=170

6 0

3 years ago

Find three numbers between -0.55 and -0.54

antoniya [11.8K]

-0.545 , -0.541 , -0.548

3 0

3 years ago

A cheetah ran 275 feet in 3.23 seconds. How fast did the cheetah run in miles per hour? Round your answer to the nearest whole m

yawa3891 [41]

First we convert feet into meters, since 1 feet is 0.3048 m: 275 feet * 0.3048 = 83.82m.

Then we do: 83.82m / 3.23s = 25.9504644 m/s.

Then we convert that into miles per hour by 2.23694, so we do:

25.9504644 * 2.23694 = 58.0496318.

Then we round it to 58 mph.

So the answer is: The cheetah was running at 58 mph.

Hope this helped! c:

6 0

3 years ago

Tony runs 3 miles in 25 minutes. at the same rate, how many miles would he run in 20 minutes?

liberstina [14]

Answer:

2.4

Step-by-step explanation:

3 / 28 = 0.12

(we do this to see how many miles he ran in a minute)

0.12 x 20 = 2.4

(then we multiply how many miles he can run in 20 minutes)

3 0

2 years ago

How to expand and evaluate

Nana76 [90]

(-1.1)*(-1.1)*(-1.1)=-1.331

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3 years ago