Question

if the mean of four observation is 20. when a constent c is added to each observation the mean becomes 22. the value of c is?

Answer 1

Hi friend
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Your answer
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Mean of four observations = 20

Sum of four observations = (20 × 4) = 80

A constant "c" is added to each observation.

New mean = 22

Now,
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(80 + 4c)/4 = 22

=> 80 + 4c = 22 × 4

=> 4c = 88 - 80

=> c = 8/4

=> c = 2

HOPE IT HELPS