Could someone help me, please? I got 4, but I’m not sure.

Mathematics

1 answer:

Slav-nsk [51]3 years ago

8 0

Answer:

Step-by-step explanation:

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Which number is a solution of the inequality? 6>z(10-z)

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You are assigned 32 math exercises for homework. You complete 87.5 of these before dinner. How many do you have left to do after

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Step by step:

This is if the question is saying you completed 87.5% of the exercises. Otherwise, I don't know what it is asking.

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Scores on a college entrance exam are normally distributed with a mean of 550 and a standard deviation of 100. Find the value th

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Answer:

The value that represents the 90th percentile of scores is 678.

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:

$\mu = 550, \sigma = 100$