Question

In a frequency distribution, the mid value of a class is 42 and the width of the class is 10, then the class interval is ________.

Answer 1

If a is the mid-value of a class interval of width h, then the lower and upper limits of the class interval are $a-\frac{h}{2}$ and $a+\frac{h}{2}$, respectively.

Here, a = 42 and h = 10.

∴ Lower limit of the class interval = $42-\frac{10}{2}=42-5=37$

Upper limit of the class interval = $42+\frac{10}{2}=42+5=47$

Thus, the class interval is 37–47.

In a frequency distribution, the mid value of a class is 42 and the width of the class is 10, then the class interval is ___37–47___.