Question

.Find missing frequency if mean of the following data is 53 Class interval 0-20 20-40 40-60 60-80 80-100 15 18 ?? 29 17​

Answer 1

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Biology

The mean of the followlng frequency table is  53. But the frequencies f1 and f2 in the classes  20−40 and  60−80 are missing. Find the missinq frequencies.

Age (in years)

0-20

20-40

40-60

60-80

80-100

Total

No. of people

15

f1

21

f2

17

100

A

f1=20,f2=28

B

f1=17,f2=19

C

f1=19,f2=25

D

f1=18,f2=29

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Correct option is

D

f1=18,f2=29

Answer:- 

 AgeNo. of people

(f) xi=2lower limit + upper limitxifi  0-20 15 10 150 20-40 f1 30