1
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The mean and variance of $$n$$ observations $$x_1, x_2, x_3, \ldots . . x_n$$ are 5 and 0 respectively. If $$\sum_{i=1}^n x_i^2=400$$, then the value of $$n$$ is equal to

A
80
B
25
C
20
D
16
2
AP EAPCET 2021 - 19th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

The variance of the variates 112, 116, 120, 125 and 132 about their AM is

A
58.8
B
60
C
48.8
D
61.8
3
AP EAPCET 2021 - 19th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following set of data has least standard deviation?

A
10, 20, 30, 40
B
2, 4, 6, 8
C
3, 6, 9, 12
D
1, 2, 3, 4
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