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Mean of Ungrouped Data

The ages of ...

Question

The ages of $40$ students in a class are given. Find the mean age of the class

A

14.5

years

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B

13

years

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C

15.5

years

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D

15

years

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Solution

The correct option is C $14.5$ years
Age in year No.of student fi.xi
12 6 72
13 8 104
14 5 70
15 7 105
16 9 144
17 5 85
Sol. We prepare the table as above.
Mean age = $\frac{Σ f i . x i}{f i} = \frac{580}{40} = 14.5$ years

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