The class marks of a distribution are : 47,52,57,62,67,72,77,82,87,92,97,102, determine the class size ,the class limits and the true class limits.

Explanation

Class size`=`difference between two consecutive class marks
Class size`=52-47`
`therefore` Class size`=5`
Lower limit `=`Class mark`-`(Class size)`/2=44.5`
Upper limit`=`Class mark`+`(Class size)`/2=49.5`
`therefore` The class limits are:
`44.5-49.5=47`
`49.5-54.5=52`
`54.5-59.5=57`
`59.5-64.5=62`
`64.5-69.5=67`
`69.5-74.5=72`