Question

31. Some surnames were picked up from a local
telephone directory and the frequency distribution
of the number of letters of the English alphabets
was obtained as follows:
Number of surnames
Number of letters
1-4
4-7
10
25
35
7-10
10-13
Х
13-16
12
16-19
8
It is given that mode of the distribution is 8, then
find the missing frequency (x).​

Answer 1

Since l=7, f1=35, f2=x, f0=25, h=3

Therefore by applying the formula [l+(f1-f0/2f1-f0-f2] *h

Ans-15