Two thousand students took an exam. The scores on the exam have an approximate normal distribution with a mean =74points and standard deviation =14 points.

Round your answers to one decimal place.

(a) Calculate the first- and third-quartile scores for this exam.

Q1= points Q3= points

(b) The middle 50% of the exam scores are between what two values? Enter your answers in increasing order. The middle 50% of the exam scores are between points and points.