1.

The teachers in a university are sorted according to their ages, as shown below.AgeNumber of Persons25 – 30630 – 351435 – 401640 – 452245 – 50550 – 55455 – 603What is the mean age of a teacher in this university?

Answer»
AgeNo. of personsMidvalueTotal
25 – 30627.5165
30 – 351432.5455
35 – 401637.5600
40 – 4522‘42.5935
45 – 50547.5237.5
50 – 55452.5210
55 – 60357.5172.5
Total702775

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

= \(\frac{2775}{70}\) = 39.64


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