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The arithmetic mean of 13 observations i...

The arithmetic mean of 13 observations is 60. If one of the observation 50 is deleted and another observation 63 is included. Find the new arithmetic mean. The following steps are involved in solving the above problem. Arrange them in sequential order.
(A) New sum of observations `=780-50+63=793`
(B) The sum of the observation `=13xx60=780`
(C) `:.` New arithmetic mean `=793/13`
(D) The required mean `=61`

A

BACD

B

BCAD

C

BDCA

D

ABCD

Text Solution

Verified by Experts

The correct Answer is:
A
(B), (A), (C) and (D) is the required sequential order. Hence, the corect option is (a).
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Arithmetic mean =( sum of all observations)/(Number of observations)