Question

Find the class mark of the class interval 60-80

Answer 1

Class mark is the mean of upper and lower limits

Thus class mark for 60-80 will be

60+80/2=140/2=70

Answer 2

Answer:

70 is the required class mark.

Step-by-step explanation:

Explanation:

Given that,class interval = 60 -80

• Class midpoint is another name for Classmark.

• Class size is the difference between the upper and lower limits of a class interval, and the class mark is the average of those two limits.

• By the definition of class mark, formula can be written as

Classmark  = $\frac{upper \ limit + lower \ limit}{2}$

Step 1:

We have, class intervals of 60 - 80

Classmark = $\frac{upper \ limit + lower\ limit}{2}$

From the question, lower limit = 60 and upper limit = 80.

⇒Class mark = $\frac{80 +60}{2}$ = $\frac{140}{2}$ = 70.

Final answer:

Hence, 70 is the required class mark.

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