HELP!!!!What is the 75th percentile for recovery times? (Round your answer to two decimal places.)

Question

The patient recovery time from a particular surgical procedure is normally distributed with a mean of 5.5 days and a standard deviation of 1.7 days.

What is the 75th percentile for recovery times? (Round your answer to two decimal places.)

 _______days

Answer 1

Must find Z_75 via reverse table

lookup such that

Prob ( z < Z_75) = 0.75

Z_75 = 0.67448975

Z_75 = (X_75 - mean)/ stnddev

Z_75 * stnddev + mean = X_75

0.67448975 * 1.7 + 5.5 = X_75

X_75 = 6.646632575