Helen's family consists of her 74-year-old grandfather, her parents aged 56 and 63, and her 17-year-old younger brother.
If Helen is 25 years old, what is the average age of her family?

55 years

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49 years

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50 years

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47 years

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Solution

The correct option is D 47 years
$A v e r a g e = \frac{S u m o f a l l d a t a p o i n t s}{N u m b e r o f d a t a p o i n t s}$

Average age of Helen's family
$= \frac{S u m o f t h e a g e s o f a l l f a m i l y m e m b e r s}{N u m b e r o f f a m i l y m e m b e r s}$

That is,
$A v e r a g e = \frac{74 + 56 + 63 + 17 + 25}{5}$
$= \frac{235}{5} = 47 y e a r s$

Thus, the average age of Helen's family is 47 years.

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Helen's family consists of her 74-year-old grandfather, her parents aged 56 and 63, and her 17-year-old younger brother. If Helen is 25 years old, what is the average age of her family?

The correct option is D 47 yearsAverage=Sum of all data pointsNumber of data points Average age of Helen's family =Sum of the ages of all family membersNumber of family members That is, Average=74+56+63+17+255 =2355=47 years Thus, the average age of Helen's family is 47 years.

Helen's family consists of her 74-year-old grandfather, her parents aged 56 and 63, and her 17-year-old younger brother.
If Helen is 25 years old, what is the average age of her family?