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3 years ago

Real numbers are (closed/not closed) under multiplication.

Mathematics

1 answer:

Sveta_85 [38]3 years ago

7 0

thanks tho

<u>next time use ur head</u> Step-by-step explanation:

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How do you solve for a y and x intercept?

FrozenT [24]

For a y-intercept, set $x = 0$ in your equation. Remember that a y-intercept intercepts the y-axis, which is found at $x = 0$ . Thus, setting $x = 0$ will give you the place where your equation intercepts the y-axis.

For an x-intercept, do the opposite, set $y = 0$ . This is because the x-axis is found at $y = 0$ . Similar to the y-intercept, this will find you the point where your equation intercepts the x-axis.

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3 years ago

Exhibit 9-2 The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the cu

Diano4ka-milaya [45]

Answer:

At a .05 level of significance, it can be concluded that the mean of the population is significantly more than 3 minutes.

Step-by-step explanation:

We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.

At the null hypothesis, we test if the mean is of at most 3 minutes, that is:

$H_0: \mu \leq 3$

At the alternative hypothesis, we test if the mean is of more than 3 minutes, that is:

$H_1: \mu > 3$

The test statistic is:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, $\sigma$ is the standard deviation and n is the size of the sample.

3 is tested at the null hypothesis:

This means that $\mu = 3$

The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes. The population standard deviation is known to be 0.5 minute.

This means that $n = 100, X = 3.1, \sigma = 0.5$

Value of the test statistic:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{3.1 - 3}{\frac{0.5}{\sqrt{100}}}$

$z = 2$

P-value of the test and decision:

The p-value of the test is the probability of finding a sample mean above 3.1, which is 1 subtracted by the p-value of z = 2.

Looking at the z-table, z = 2 has a p-value of 0.9772.

1 - 0.9772 = 0.0228

The p-value of the test is of 0.0228 < 0.05, meaning that the is significant evidence to conclude that the mean of the population is significantly more than 3 minutes.

6 0

3 years ago

A total of 150 students voted for the class president.Bianca got 43 votes and Carlos recieved 38% of the votes. Which student re

e-lub [12.9K]

Answer:C got more by 57 to 43 which is 14

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

Triangle sum and exterior angle theorem.

wlad13 [49]

Did two of them for you as reference for the rest.