S. 25)
22. The average monthly wages of a group of 10 person is Rs. 9000. One
person is Rs. 9000. One member of the group, whose
monthly wages Rs 18000, leaves the group and is replaced by a
ow, leaves the group and is replaced by a new member whose monthly wages is
Rs. 7200. Find the new monthly average wage(Ans. Rs. 8910)
23.The mean of 150 items was found to be
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