Question

Find the mean number of leaves per tree using step deviation method.

• A. $10.4$
• B. $11$
• C. $12$
• D. $13$

Answer 1

The correct option is A $10.4$

Answer:-

Class interval width (i) = 4

No. of leaves	X	No. of trees F	$u=\frac{X-A}{i}$	Fu
0-4	2	10	-1	-10
4-8	6 = A	20	0	-0
8-12	10	30	1	30
12-16	14	40	2	80
		$\Sigma f=100$		$\Sigma fu=110$

Mean = $A+\frac{\Sigma fu}{\Sigma f}=6+\frac{110}{100}\times 4=6+4=10.4$

10.4 leaves