The variances of IS and DS are:
A) .0145; .00038.
B) .011584; .000304.
C) .006454; .000154.
D) .0008068; .000193.

Question

Quizplus · Accepted Answer

By using the given formula:

Variance = [(∑(X-M)^2)/n]

Here, we have:

For IS: 
n=10, ∑X=800, M=80,
∑(X-M)^2= 0.8112
Variance = [(0.8112)/10] = 0.08112

For DS:
n=12, ∑X=1120, M=93.33,
∑(X-M)^2=0.995328
Variance = [(0.995328)/12] = 0.08294

Hence, the answer is option B.

The Variances of IS and DS Are