Question

find the class if the class mark is 10 and class width is 6

Answer 1

let the lower limit be x
let the upper limit be x +6
class marks = lower limit + upper limit/2
10 = x+ x+6/2
10 =2x +6/2
10×2= 2x + 6
20= 2x +6
20 - 6 =2x
14=2x
2x=14
x= 14/2
x =7
x+6= 7+6= 13
then the class interval:
7 - 13
13- 19 and so on

Answer 2

Answer:

We have, class mark = 10 and class width = 6.

Since, 6/2=3

The lower class limit = 10−3=7 and the upper class limit = 10+3=13.

So, the class is 7-13.