A) 3
B) 7
C) 17
D) 31
Correct Answer: B
Solution :
Mean, \[=\frac{3+11+9+7+15+13+8+19+17+21+14+x}{12}\]According to question, \[=\frac{137+x}{12}=12\] \[\therefore \] \[137+x=144\] \[\therefore \] \[x=144-137=7\]You need to login to perform this action.
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