Question

Based on experience, the time required to complete a college statistics exam is normally distributed with a mean of 42 minutes and a standard deviation of 8 minutes. The class is a large lecture and has 900 students. Simulate the exam completion times for the 900 students. (Convert to a percent then round to two decimals) a) What percent of students are still working when the professor stops the exam at 50 minutes? % b) What percent of students are still working when the professor stops the exam at 60 minutes?

Answer 1

Normal distribuln ( 42 min Mean standa dwraln 8min class is god student larg leutne and has still in5 fer centage studan as whe Ie ebeorstop exam at So min he K noma ditib int wrte this meam m&m Z Score distribul tab

O.8413 Ey,137 8y,13 4,13 72 I norma dietrbutum) mean fn to 22.2 7-225 応 t bail rao 25un ol 22s fom kmoma standsd tab Pl225 0.98418 98,7782 98.72 P 9872 そム2.25