Question

Let m be the mid-point and l be the upper-class limit of a class in a continuous frequency distribution. The lower class limit of the class is ______.

Options

• 2m + l

• 2m – l

• m – l

• m – 2l

Answer 1

Let m be the mid-point and l be the upper-class limit of a class in a continuous frequency distribution. The lower class limit of the class is 2m – l.

Explanation:

Given: Mid-point = m

Upper class limit = 1

As, we know that, mid-point = `("Upper class-limit" + "Lower class-limit")/2`

So, `m = (l + "Lower class-limit")/2`

l + Lower class-limit = 2m

Lower class-limit = 2m – l

Hence, the lower class limit of the class is 2m – l.