Question

2. The grades on a statistics midterm exam were normally distributed with a
mean of 72 and a standard deviation of 8.
a. What is the proportion of students received a B grade.
b. What is the proportion of students that failed the exam?
c. What is the grade of the 92nd percentile?
Cannot answer a and b unless you know point value for B and F. Once you find the point values, use the equation below.

c. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.92) for a Z score. Put Z score and other values into the equation below and solve.

Z = (score-mean)/SD

Related Questions

In a large class, there were 220 students who wrote both the midterm and the final exam. The standar... Write a program that requests the numeric grades on a midterm and a final exam and then uses a Funct... Exam Grades. A statistics professor is used to having a variance in his class grades of no more than... professor has found that the grades on a Statistics Exam are normally distributed with mean 72 and a...