Question

The mean of 21 observation is 12.5. If an observation 12.5 is deleted, then the mean of the remaining
observations is(It is better if u answer along with explanation)

A) 102
B) 10.5
C) 12.5
D) 12​

Answer 1

Answer:

New Mean = 12.5

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Step-by-step explanation:

Original Mean = 12.5

Number of Observation = 21

Total Observation = 21 × 12.5 = 262.5

Now, 12.5 observation is deleted.

New number of observation = 20

New Total Observation = 262.5 - 12.5 = 250

New Mean = 250/20 = 12.5