Posted by Leeza on .
I can't seem to figure out the class interval for this grouped frequency distribution table:
Highest Score=684
Lowest Score=56
& the professor has instructed us to use an interval size of 61
The starting point needs to be divisible by 61 due to convention.
But the lowest score 56 is not divisible by 61. Help!

statistics 
drwls,
How about starting at zero score and having 13 intervals?:
061
62123
124185
etc.
620681
682743