Question

The mean of 20 observations is 12.5.By the error ,one of the observation was noted as(-15) instead of 15.Then the correct mean is :
(a)11.75 (b)11 (c)14 (d)13.25

Answer 1

Answer:

14

Step-by-step explanation:

Mean= Total sum/number

12.5=x/20

x=250

since we wrote -15 instead of 15 we will add 30

So 250+30/20=280/20

=14

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