the maean age of a family of 6 members is 25 years. the mean age of the family after a 45 year old member leaves is?

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Solution

Mean is the average so , mean = sum of ages/ number of persons
So mean is given as 25 years, so mean â¨¯ number of person = sum of ages
Hence the sum of ages = 25 â¨¯ 6 =150 years.

A 45 year old member leaves, hence the sum of age will be 150 -45 =105 years.
And the number of persons is now 5, as one member leaves.
Hence the new mean is 105/5 = 21 years

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