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Q.

The mean of the 5 numbers is 32. If one of the numbers is excluded, then the mean is reduced by 4. Find the excluded number.


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a

48

b

40

c

30

d

38 

answer is A.

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Detailed Solution

Mean of 5 numbers =32.
Sum of these numbers =32×5=160   (Since, nx̲=∑x)
Mean of 4 numbers =32−4=28
Sum of these 4 numbers =28×4=112
Excluded number = (Sum of the 5 given numbers)  (Sum of the 4 numbers)

                             =160−112
                             =48
 
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