Question

In the first proofreading of a book containing $300$ pages the following distribution of misprints was obtained:

No. of misprints per page ($x$)	$0$	$1$	$2$	$3$	$4$	$5$
No. of pages ($f$)	$154$	$95$	$36$	$9$	$5$	$1$

Find the average number of misprints per page.

Answer 1

Answer:-

No. of misprints per page (x)	No. of pages (f)	fx
0	154	0
1	95	95
2	36	72
3	9	27
4	5	20
5	1	5
	$\Sigma f=300$	$\Sigma f=219$

Average number of misprints per page $\overline{x}$ $=\frac{\Sigma fx}{\Sigma f}=\frac{219}{300}=0.73$