Question

Find the upper limit of the first class-interval in class-intervals 8-11,12-15,16-19,....

Answer 1

8-11=Upper limit is 11

12-15= Upper limit is 15

16-19= Upper limit is 19

You can see that the difference between the Upper limits of the consecutive class interval is 4. So the upper liMit of the next class interval will be 19+4=23 and so on.

Hope this helps you.