"A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13
Channel: Doubtnut
Date: 2020-04-05

"A student
 was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8,
 19, 17, 21, 14 and `x`
. He found
 the mean to be 12. What should be the number in place of `x`
?
(a) 3 (b) 7 (c) 17
 (d) 31"