A random sample of 20 people is classified in the following table according to their ages
Age Frequency
15-25 2
25-35 4
35-45 6
45-55 5
55-65 3
What is the mean age of this group of people?

41.0

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41.5

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42.0

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42.5

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Solution

The correct option is D $41.5$
$M e a n = \frac{\sum (f r e q u e n c y \times M i d - P o i n t)_{i}}{\sum (f r e q u e n c y)_{i}}$
$M e a n = \frac{830}{20} = 41.5$

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A random sample of 20 people is classified in the following table according to their agesAgeFrequency15-25225-35435-45645-55555-653What is the mean age of this group of people?

The correct option is D 41.5Mean= ∑(frequency×Mid−Point)i∑(frequency)iMean= 83020=41.5

A random sample of 20 people is classified in the following table according to their ages
Age Frequency
15-25 2
25-35 4
35-45 6
45-55 5
55-65 3
What is the mean age of this group of people?

The correct option is D $41.5$
$M e a n = \frac{\sum (f r e q u e n c y \times M i d - P o i n t)_{i}}{\sum (f r e q u e n c y)_{i}}$
$M e a n = \frac{830}{20} = 41.5$