data (x) (mean) (x-mean) (x-mean)^2
1.00 17.40 -16.40 268.96
2.00 17.40 -15.40 237.16
4.00 17.40 -13.40 179.56
16.00 17.40 -1.40 1.96
64.00 17.40 46.60 2171.56
87.00 2859.20
sum=87 (n-1)=4
n=5 4.00
17.40 714.80
mean=17.40 26.74
s=26.74
grade range midpoint start f
A 90-99 95.00 90.00 5.00
B 80-89 85.00 80.00 10.00
C 70-79 75.00 70.00 15.00
Frequency
16.00
15.00
14.00
13.00
12.00
11.00
10.00
Frequency
9.00
8.00
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
95.00 85.00
Grade %
75.00