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# Find the class mark of classes 15.5 – 18.5 and 50 – 75.

Last updated date: 20th Jul 2024
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Hint: First we will understand the terms ‘class mark’ and then we will solve the two subparts of the question one by one. Now, first consider the class interval 15.5 – 18.5 and compare it with the class interval a – b, where ‘a’ is called the lower limit and ‘b’ is called the upper limit of the class interval. Use the formula: - Class mark = $\dfrac{a+b}{2}$ to get the answer. Apply the same process for the class interval 50 – 75.

In mathematics, class mark is defined as the average or arithmetic mean of the lower and upper limit of a class interval. Suppose we have a class interval a – b where ‘a’ is the lower limit and ‘b’ is the upper limit of the class interval, therefore the class mark is given as: - Class mark = $\dfrac{a+b}{2}$. Let us solve for the two subparts of the question one by one.
$\Rightarrow$ Class mark = $\dfrac{15.5+18.5}{2}$
$\Rightarrow$ Class mark = $\dfrac{34.0}{2}$
$\therefore$ Class mark = 17
$\Rightarrow$ Class mark = $\dfrac{50+75}{2}$
$\Rightarrow$ Class mark = $\dfrac{125}{2}$
$\therefore$ Class mark = 62.5