Question

A professor at a local college noted that the grades of his students were normally distributed with an average percentage of 74 and a population standard deviation of 10. He found that 6.3% of his students received A's while 2.5% of his students failed the course and received F's. Based upon the professor's grading scale, what was the minimun percentage needed to get an A in the course?
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the Z score related to your proportion. Put that value along with the values of mean and SD to find the score.

Related Questions

One particularly nice afternoon, several students were trapped in a classroom listening to a monoton... One study claimed that 91% of college students identify themselves as procrastinators. A professor...