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? [NDA II 2016]

NDA Math Statistics

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A random sample of 20 people is classified in the following table according to their ages:

What is the mean age of this group of people?

[NDA II 2016]

Age	Mid value xi	Frequency fi	fixi
15-25	20	2	40
25-35	30	4	120
35-45	40	5	240
45-55	50	6	250
55-65	60	3	180
		∑fi=20	∑xi‌fi=836

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