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yarga [219]
3 years ago
8

What is the exact value

Mathematics
1 answer:
ehidna [41]3 years ago
5 0
Add all the x and you get 14x. Full circle = 360 degrees. 14x=360. x=360/14 x=25.71 degrees
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Cos 315° is about 0.71.
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Read 2 more answers
A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30 What score is necessary to reach
nlexa [21]

Answer:

A score of 150.25 is necessary to reach the 75th percentile.

Step-by-step explanation:

Problems of normal distributions can be 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.

A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30.

This means that \mu = 130, \sigma = 30

What score is necessary to reach the 75th percentile?

This is X when Z has a pvalue of 0.75, so X when Z = 0.675.

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

0.675 = \frac{X - 130}{30}

X - 130 = 0.675*30

X = 150.25

A score of 150.25 is necessary to reach the 75th percentile.

7 0
3 years ago
A carnival game has 3 identical boxes. The boxes have the following amounts of money: one has $30.00, one has $6.00, and one has
garri49 [273]
$200 divided by 100 customers = 2$.

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Answer:

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Step-by-step explanation:

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1 - 9i²; i² = -1, therefore 1 - 9(-1) = 1 + 9 = 10

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How to solve 36x+3(34x+9)
Softa [21]

Answer: 138x + 27

Step-by-step explanation:

First you distribute the 3, creating 102x +27.

Then you combine like terms, creating 138x + 27

You can't do anything else so that's your answer.

7 0
3 years ago
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