the class marks of distribution are 23 28 33 38 43 48 53 58 63 68 determine true class limits

Class size (h) : 28 - 23 = 5
Class limit :
Lower limit ---
a - h/2
23-5/2 = 23- 2.5 = 20.5
Upper limit ----
a + h/2 = 23 + 5/2 = 23 + 2.5 = 25.5
True Class Limit
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
40.5 - 45.5
45.5 - 50.5
50.5 - 55.5
55.5 - 60.5
60.5 - 65.5
65.5 - 70.5
hope this helps