Question

5
iv) Write the class mark of class 80-90 (Use formula)
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Answer 1

Answer:

Now, coming to our question, we have been given the class interval as (80 – 90). So, we can find the class mark as 80+902=1702=85. Therefore, the class mark of the class interval (80 – 90) is 85. So, the correct answer is “Option D

Answer 2

Class mark = (Upper class limit + Lower class limit) / 2

= (90 + 80) / 2

= 170 / 2

= 85