Question

84.
From a series of 50 observations if an observation having value 45 is dropped then mean remans 9.
same. What is the mean of 50 observations?
(A) 50
(B) 49
(C) 45
(D) 40​

Answer 1

Answer:

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Answer 2

Answer:

Mean of 50 observations is 9.72

Step-by-step explanation:

Let the sum of 50 observations is N.

x = N÷50

If the value of 45 is taken , then the mean is 9.

(N - 45)÷49= 9

(N-45)= 49×9

N = 486

Now the actual mean,

x = 486÷50.

x = 9.72