This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
d. 35
To find the midpoint of a class interval, add the lower limit and the upper limit, then divide by 2.
Step 1: Identify the lower and upper limits of the class interval. The class interval is 30-39. Lower limit = 30 Upper limit = 39
Step 2: Calculate the sum of the lower and upper limits.
Step 3: Divide the sum by 2 to find the midpoint.
Step 4: Round the midpoint to the nearest whole number. Rounding 34.5 to the nearest whole number gives 35.
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To find the midpoint of a class interval, add the lower limit and the upper limit, then divide by 2.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.