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3 years ago

56 books 75 percent decrease

Mathematics

1 answer:

BigorU [14]3 years ago

5 0

Answer

It’s 42

Because u need to multiply it

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The combined math and verbal scores for females taking the SAT-I test are normally distributed with a mean of 900 and a standard

Genrish500 [490]

Answer:

50% of females do not satisfy that requirement

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

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

The Z-score 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. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 900, \sigma = 200$

If a college includes a minimum score of 900 among its requirements, what percentage of females do not satisfy that requirement

This is scores lower than 900, which is the pvalue of Z when X = 900.

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

$Z = \frac{900 - 900}{200}$

$Z = 0$

$Z = 0$ has a pvalue of 0.5

50% of females do not satisfy that requirement

7 0

3 years ago

A researcher is interested in determining the average number of years new teachers remain in the classroom. If past information

seraphim [82]

Answer: 385

Given: error: 6 months, standard deviation = 5 years is 60 months

Step 1: find the minimal sample size ‘n’ for 95% confidence interval

1-0.95= 0.05

0.05/2= 0.025

Step 2:
1-0.025= 0.975

View attachment for more steps

8 0

3 years ago

Simplify the expression: -4(6v-2)

djverab [1.8K]

Answer:

-24v + 8 by the distributive property

Step-by-step explanation:

Start by multiplying 6v by -4

-4 × 6v = -24

Then multiply -2 by -4

-2 × -4 = 8

When we add these together, we get the following:

-24v + 8

3 0

2 years ago

Shapes A and B are similar.

kari74 [83]

The scale factor from A to B is 5/3 and the value of r is 33/5

<h3>The scale factor from A to B</h3>

From the figure, we have the following corresponding sides

A : B = 5 : 3

Express as fraction

B/A = 3/5

This means that, the scale factor from A to B is 5/3

<h3>The value of r</h3>

From the figure, we have the following corresponding sides

A : B = 11 : r

Express as fraction

B/A = r/11

Recall that:

B/A = 3/5

So, we have:

3/5 = r/11

Multiply by 11

r = 33/5

Hence, the value of r is 33/5