Two years ago the mean age of 40 people was ll years. Now a person left the group and the mean age has changed to 12 years. Find the age of the person who left the group.
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Step-by-step explanation:
mean age of 40 people 2 yrs ago=11
total=11*40
total-2*40=440
total=440+80
total=520
after person left mean of 39= 12
total=39*12
total=468
left person weight= 520-468
=52
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