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The average of 50 numbers is 38. If two numbers namely 45 and 55 are discarded, the average of the remaining numbers is :
Given that average age of 50 members = 38 years
So using , average = $$\frac{SumofAge}{number of persons}$$
Sum of ages = 50 x 38 = 1900
Now 45 and 55 are discarded and hence number of term left = 48
and Total Sum left = 1900 - 45 - 55 = 1800
New Average = $$\frac{1800}{48}$$ = 37.5
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