Answer :

To find the class mark of the class [tex]$35.5-45.5$[/tex], you need to calculate the midpoint of the class interval. The class mark is found by taking the average of the lower and upper limits of the class.

Here are the steps to find the class mark:

1. Identify the lower limit of the class interval: This is the smallest number in the interval. For the class [tex]$35.5-45.5$[/tex], the lower limit is 35.5.

2. Identify the upper limit of the class interval: This is the largest number in the interval. For the class [tex]$35.5-45.5$[/tex], the upper limit is 45.5.

3. Calculate the average (midpoint) of the two limits: Add the lower limit and the upper limit together, then divide by 2.

Class mark = [tex]\(\frac{35.5 + 45.5}{2}\)[/tex]

4. Calculate the result:

Class mark = [tex]\(\frac{81}{2} = 40.5\)[/tex]

So, the class mark of the class [tex]$35.5-45.5$[/tex] is 40.5.

The correct answer is D) 40.5.

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