Question

	Answers
Range	?
Variance	?
Standard deviation	?

Letter Grade	Percentage	Frequency #	Cumulative Frequency #
A	93–100	1	1
A-	90–92.9	1	2
B+	87–89.9	2	4
B	83–86.9	3	7
B-	80–82.9	5	12
C+	77–79.9	4	16
C	73–76.9	3	19
C-	70–72.9	1	20
D+	67–69.9	0	20
D	60–66.9	2	22
F	Below 59.9	1	23

5. Use the formulas for range, population variance, and population standard deviation with the “Percentage Grade Total” to complete the following table. Make sure to check your answers with MS Excel. Also, round your answers to four decimal values.

Answer 1

Range =max-min =100-0 =100