What will be the Fourth Number? If

The average of 6 observations is 45.5. If one new observation is added to the previous observations, then the new average becomes 47. The new observation is:

  1. 58
  2.  56
  3.  50
  4.  46

 

Monis Rasool Professor Asked on 28th July 2015 in Maths.
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1 Answer(s)
Best answer

Answer: (2) 56
Explanation:-
The average of 6 observations = 45.5
Then, the sum of 6 observations = 45.5 x 6
= 273

One new observation added,
Then, the new average = 47
The sum of 7 observation = 7 x 47
= 329

The new observation = 329 – 273
= 56

Hence, the answer is (2) 56.

Anurag Mishra Professor Answered on 28th July 2015.
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