Statistics Practice Test 1

Question : 4 of 37

Marks: +1, -0

If the mean of 4 observations is 20, when aconstant ‘C’ is added to each observation, themean becomes 22. The value of C is:

6
-2
2
4

Validate

Solution:

Mean of 4 observations = 20
Sum of 4 new observations = 20 × 4 = 80
When constant c is added to each observation, the mean becomes = 22
Sum of 4 new observations = 22 × 4 = 88
Total C is added in 4 observation = 88 - 80 = 8
The value of C

=8/4=2

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