using same web site for normal dist
A = .1
M = 72
sd = 9
.1 area is anything below 60.46
If I try bottom .3, anything below a C, I get
A = .3 ---> below 67.28, that is the boundary for the HIGHEST D
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule:
The top 10% receive A's.
The next 20% receive B's.
The middle 40% receive C's.
The next 20% received D's.
The bottom 10% receive F's
What is the least amount of points that a student must score, on the final exam, in order to earn a D? (Round your answer to two decimal places.)
67.32 is the answer
1 answer
1 answer