Answer :
Final answer:
The class mark of the interval 30.5 to 35.5 is 33, which is found by averaging the lower and upper class boundaries of the interval.
Explanation:
The class mark of a class interval is calculated as the midpoint of the two boundaries of the class. So, for the class interval of 30.5 to 35.5, we find the class mark by averaging the lower and upper class boundaries. This means we add 30.5 and 35.5 together and then divide by 2.
So, the class mark calculation would look like this: (30.5 + 35.5) ÷ 2 = 33.
Therefore, the class mark for the class interval 30.5 to 35.5 is 33.
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