Question

31. The median for the following distribution is 26. Find the missing frequency. CI 0 - 10 10-20 20-30 40-50 comp 30 - 40 6 F 3 5 4​

Answer 1

Step-by-step explanation:

CI F CF

0-10 6 6

10-20 f 6+f

20-30 3 9+f

30-40 5 14+f

40-50 4 18+f

So Given that n= 10

so, 18+f = 10

I. e., f = 8 ----equation (1)

The median is 26 , which lies in the class 20-30

So, I = 20 , f = 3, CF = 9+f , h = 10

By using the formula for we get

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

by this also we get F= -4/5

as we know f = 8 from that solution we get this equation

• 6+8=14
• 9+8=17
• 14+8=22
• 18+8=26

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