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What is the midpoint of the class interval 30-39, rounded to the nearest whole number?

May 4, 2026Mathematics

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Answer

4 steps

To find the midpoint of a class interval, add the lower limit and the upper limit, then divide by 2.

Identify the lower and upper limits of the class interval.
The class interval is 30-39.
Lower limit = 30
Upper limit = 39
Calculate the sum of the lower and upper limits.
$30 + 39 = 69$
Divide the sum by 2 to find the midpoint.
$\frac{69}{2} = 34.5$
Round the midpoint to the nearest whole number.
Rounding 34.5 to the nearest whole number gives 35.

The correct option is d.
$\boxed{\text{d. 35}}$

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