Question

If the mean of the following frequency distribution
is 49. Find the value of P
class 0-20 20-40 40-60 60-80 80-100)
frequency 2 6 P 5 2

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Answer 1

Answer:

C.I. fi. xi. fixi

0-20. 2. 10. 20

20-40. 6. 30. 180

40-60. p. 50. 50p

60-80. 5. 70. 350

80-100. 2. 90. 180

Total:- 15+p 780

mean:-49

780/15+p=49

780=49(15+p)

780=735+15p

780-735=15p

45=15p

45/16=p

3=p

hence,p=3