Question Help Assume that adults have IQ scores that are normally distributed with a mean of 101.1101.1 and a standard deviation 17.717.7. Find the first quartile Upper Q 1Q1, which is the IQ score separating the bottom 25% from the top 75%

Q1 = 89.1525

Step-by-step explanation:

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

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

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:

Find the first quartile Upper Q 1Q1, which is the IQ score separating the bottom 25% from the top 75%

This is the value of X when Z has a pvalue of 0.25. So it is X when Z = -0.675.

So

Q1 = 89.1525

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