The product of b and 7

Mathematics

1 answer:

pshichka [43]2 years ago

4 0

Answer:

i need help with my math homework someone please help mee

Step-by-step explanation:

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Question 5 The enrollment at Davis Middle School dropped by 72 students over a 9 year period. What is the average yearly drop in

Mamont248 [21]

Answer:

it's 8

Step-by-step explanation:

just get 72 and divide it by 9 and that's the average over the 9 years.

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2 years ago

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icang [17]

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3 years ago

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If IQ scores are normally distributed with a mean of 100 and a standard deviation of 5, what is the probability that a person se

notsponge [240]

Answer:

2.28% probability that a person selected at random will have an IQ of 110 or higher

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:

$\mu = 100, \sigma = 5$