Arithmetic Goes Mad !
Probability
Level
1
The arithmetic mean of 10 numbers is -7. If 5 is added to every number, find the new arithmetic mean ?
5
4
2
-2
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1 solution
given :- AM=-7 i.e N/10=-7 or N=-70 now 5 added to each 10 no.s will result +50 in N. So new N(say NN) will be -70+50=-20 So new AM=-20/10=-2