### The average of 50 numbers is 38. If two numbers, namely 45 and 55 are discarded, the average of the remaining numbers is ?

A. 37.5 B. 37.9 C. 36.5 D. 37.0 Answer: Option A
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### Solution(By Apex Team)

According to the question, Average of 50 numbers is = 38 Sum of 50 numbers is = 38 × 50 = 1900 Two numbers discarded = 45 + 55 = 100 Sum of 48 numbers = 1900 – 100 = 1800 $\begin{array}{l }\text{∴ Average }\\ =\Large\frac{1800}{48}\\ =37.5\end{array}$

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A. 18
B. 20
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A. 10 years
B. 10.5 years
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### If the arithmetic mean of 0, 5, 4, 3 is a, that of -1, 0, 1, 5, 4, 3 is b and that of 5, 4, 3 is c, then the relation between a, b, and c is.

A. a = b = c
B. a : b : c = 3 : 2 : 4
C. 4a = 5b = c
D. a + b + c = 12
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