"Scores on an English test are normally distributed with a mean of 37.4 and a standard deviation of 7.9. Find the score that separates the top 59% from the bottom 41%"

The score that separates the top 59% from the bottom 41% is 35.6225

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 score that separates the top 59% from the bottom 41%"

This is the value of X when Z has a pvalue of 0.41. So it is X when Z = -0.225.

The score that separates the top 59% from the bottom 41% is 35.6225

correct answer:

i^31 = -i