the average age of a group of 8 persons was 14 years. a person with age 28 years left the group and a new person with age 28 years left the group and a new person with 16 years joined the group. find the new age pf the group?
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-(28-14) +(16-14) /8
= -14+2/8 = -12/8 = -3/2 = -1.5
new average age = 14-1.5 = 12.5 years
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