Tree Diagram

Q.

The daily income of a sample of $50$ employees are tabulated as follows :

Income (in Rs)	$1-200$	$201-400$	$401-600$	$601-800$
Number of employees	$14$	$15$	$14$	$7$

Find the mean of daily income of employees.

Q.

What is mean deviation continuous frequency distribution?

Q.

Find arithmetic mean of the following frequency distribution by step deviation method.
$\begin{array}{ccccccc}\text{Variate}& 5& 10& 15& 20& 25& 30\\ \text{frequency}& 20& 43& 75& 67& 72& 45\end{array}$

1. 19.09
2. 20.09
3. 12.09
4. 30.09

Q.

Calculate the mean of the following distribution using step - deviation method.
$\begin{array}{cc}\text{Class Interval}& \text{Frequency}\\ 50-55& 5\\ 55-60& 20\\ 60-65& 10\\ 65-70& 10\\ 70-75& 9\end{array}$

1. 54
2. 64.5
3. 62.3
4. 34.8