Answser the question<br> 90+7x(7-1)

HELP ITS MATH AND I SUCK AT MATH WILL GIVE BRAINLIEST :)))))

Snowcat [4.5K]

Answer:

i believe it's A. f(x) slope is greater than g(x) slope

Step-by-step explanation:

the slope of f(x) is -2, while g(x) is -6. you may think "why isn't -6? 6 is bigger, isn't it?" In this case, they're both negative so the number closer to zero is the greater one

3 0

4 years ago

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(b) The table below indicates the cost of certain air tel kiosk Z 0.15 0.20 0.25 0.75 0.80 0.85 1.85 1.90 1.95 2.00 2.05 QZ 0.05

marshall27 [118]

Using the normal distribution, it is found that there is a

a) 0% probability that the number of calls received at the switchboard will be exactly 578.

b) 0.1586 = 15.86% probability that the number of calls received at the switchboard will be less than 570.

c) 0.9485 = 94.85% probability that the number of calls received at the switchboard will be between 561 and 600.

<h3>Normal Probability Distribution</h3>

In a <em>normal distribution</em> with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

It measures how many standard deviations the measure is from the mean.

After finding the z-score, we look at the z-score table and find the p-value associated with this z-score, which is the percentile of X.

In this problem:

The mean is of 580, hence $\mu = 580$ .

The standard deviation is of 10, hence $\sigma = 10$ .

Item a:

In the normal distribution, the probability of an exact value is 0%, hence, 0% probability that the number of calls received at the switchboard will be exactly 578.

Item b:

The probability is the <u>p-value of Z when X = 570</u>, hence:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{570 - 580}{10}$

$Z = -1$

$Z = -1$ has a p-value of 0.1586.

0.1586 = 15.86% probability that the number of calls received at the switchboard will be less than 570.

Item c:

This probability is the <u>p-value of Z when X = 600 subtracted by the p-value of Z when X = 561</u>, hence:

X = 600:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{570 - 580}{10}$

$Z = 2$

$Z = 2$ has a p-value of 0.9772.

X = 561:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{561 - 580}{10}$

$Z = -1.9$

$Z = -1.9$ has a p-value of 0.0287.

0.9772 - 0.0287 = 0.9485.

0.9485 = 94.85% probability that the number of calls received at the switchboard will be between 561 and 600.

You can learn more about the normal distribution at brainly.com/question/24663213

8 0

2 years ago

A grocery store has an average sales of $8000 per day. The store introduced several advertising campaigns in order to increase s

Ann [662]

Answer:

a) Z= 0.0228

b) based on the critical value, it is a one tailed test

c) Since the p-value is less than the level of significance (α= 0.05) so we reject the null hypothesis.

This implies that the advertising campaign has been effective in increasing sales.

Step-by-step explanation:

The null hypothesis is H₀ : µ = 8000

The alternative hypothesis is H₁ : µ ˃ 8000

Mean (µ) = 8000

Standard deviation (σ) = 1200

n = 64

We will use the Z test to test the hypothesis

Z = (X - µ)/ (σ/√n)

Z = (8300 – 8000)/ (1200/√64)

Z = 300/ (1200/8)

Z = 300/ 150

Z= 2

From the normal distribution table,

2 = 0.4772

Φ(z) = 0.4772

Since Z is positive,

P(x˃a) =0.5 - Φ(z)

= 0.5 – 0.4773

= 0.0228

The required P-value = 0.0228

The P-value of one tail Z test at α= 0.05 level of significance

P-value = p(Z˃2.5)

= 0.0228

Since the p-value is less than the level of significance (α= 0.05) so we reject the null hypothesis.

This implies that the advertising campaign has been effective in increasing sales.

3 0

3 years ago

F(x)=x^3-6/x find the following<br> F(-2)

Yuri [45]

Answer:

F=6

Step-by-step explanation:

7+8-9

=6

6 0

3 years ago

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If the annual interest rate is 12%, what is the monthly interest rate?

nordsb [41]

1. A

2. C

3. D

4. A

5. B

Hope this helps

4 0

3 years ago

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Answser the question 90+7x(7-1)