The mean of 5 observations is 12. If one observation 20 is deleted, what is the new mean?

Topic: Averages
Subtopic: Mean

A10

B11

C12

D13

Explanation

Sum of 5 observations = 5 * 12 = 60. New sum after removing 20 = 60 – 20 = 40. New mean = 40 / 4 = 10.

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