Question

write the formula of calculating class mark​

Answer 1

The average of the class limits is (180 + 199) / 2 = 189.5. ... You might see the class mark defined as the average of the class boundaries as well. You'll get the same result. The same bin might have class boundaries of 179.5, 199.5, giving (179.5 + 199.5) / 2 = 189.5.

Answer 2

Step-by-step explanation:

let class intervel be 30_40

lower limit =30

upper limit =40

30_40 =35

formula

upper limit +lower limit ÷2