Question

Prepare a continuous grouped frequency distribution from the following data:
Mid-point 5 15 25 35 43
Frequency 4 8 13 12 6
Also find the size of class intervals.

Answer 1

We know that , if $m$ is the midpoint fo a class and $h$ is the class size,

then lower limit of class interval $=m-\frac{h}{2}$

Upper limit of class interval $=m+\frac{h}{2}$

We have class sixe, $15-5=10$

so the class interval formed from the midpoint $5$ is

$=\left(5-\frac{10}{2}\right)-\left(5+\frac{10}{2}\right)i.e0-10$

Containing in the same manner, the continuous classes formed are;