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 the 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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