RRB Group D Model Paper 1 with solutions

Question : 74 of 100

Marks: +1, -0

Find the value of a if the average of 4, 17, 5, 8, 12, 13, 7, 19, 24, 21, a and 14, is 15.

Solution:

(4)
Average =

{\Sum \of \all \numbers}/ {\Counting \of \numbers}

⇒15 =

{4+ 17+ 5+ 8 +1 2+ 13 +7+ 19+ 24 +21+ a +14} /12

⇒ 144 + a = 180 ⇒ a = 36

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