Average Practice Test 2

Question : 7 of 40

Marks: +1, -0

A student was asked to find the average of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the average to be 12. What should be the number in place of x?

Validate

Solution:

Here,

{3+11+7+9+15+13+8+19+17+21+14+x}/12=12

⇒137 + x = 144 ⇒ x = 7

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