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 ?
Created: 6 years ago |
Updated: 3 years ago
best des
(3 + 11 + 7 + 9 + 15 + 13 + 8 + 19 + 17 + 21 + 14 + x)/12 = 12
137 + x /12 = 12
x = 144 - 137
x = 7
Md Azizur Rahman
Founder of Satt
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