Math, asked by kulkarnisanjay5928, 10 months ago

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) 6 B) 7 C) 8 D) 9

Answers

Answered by kandipalliramya
0

answer _

137+x=144

x=7......

Answered by Guhanesh
1

Answer:

B) 7

Step-by-step explanation:

Mean = sum of all observations/ total no. of observations

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

12(12)=137+x

144=137+x

x=144-137

x=7

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