Question

find missing frequency f1 and f2 in the following n=100 and median = 32​

Answer 1

class f cf

0-10 10 10

10-20 x 10+x

20-30 25 35+x

30-40 30 65+x

40-50 y 65+x+y

50-60 10 75+x+y

75+x+y

75+x+y=100

x+y=25

f = 30 ,h = 10 , cf = 35+x, n / 2 = 50

Median= 1 +( n / 2 - cf / f ) h

32=( 50 -35 - x / 30 ) × 10

32−30= 15−x / 3

6 = 15−x

x = 9

∴y = 16

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