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Question

The weights in kilogram of 9 members in a school boxing team are 54,59,x,53,73,49,50,58,45. If the average is 56, then x is:
  1. 61kg
  2. 62kg
  3. 64kg
  4. 63kg

A
62kg
B
64kg
C
61kg
D
63kg
Solution
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Given weight in kg is: 54,59,x,53,73,49,50,58,45.


We know, Mean is given by,

Mean=Sum of the elementsTotal number of elements.


Here, the number of members =9.

Also, average weight =56kg.


Then,

56=54+59+x+53+73+49+50+58+459

56=441+x9

56×9=441+x

504=441+x

x=504441=63kg.


Therefore, option D is correct.

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