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in Statistics by (51.8k points)
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The teachers in a university are sorted according to their ages, as shown below.

Age Number of Persons
25 – 30 6
30 – 35 14
35 – 40 16
40 – 45 22
45 – 50 5
50 – 55 4
55 – 60 3

What is the mean age of a teacher in this university?

1 Answer

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Best answer
Age No. of persons Midvalue Total
25 – 30 6 27.5 165
30 – 35 14 32.5 455
35 – 40 16 37.5 600
40 – 45 22 ‘42.5 935
45 – 50 5 47.5 237.5
50 – 55 4 52.5 210
55 – 60 3 57.5 172.5
Total 70 2775

Mean age = \(\frac{Total\,age}{No\,of\,persons}\)

\(\frac{2775}{70}\) = 39.64

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