Question

The class marks of the observations are 17, 21, 25, 29, 33, 37, 41, 45. Find the class intervals.​

Answer 1

Answer:

The class intervals are 15-19,19-23,23-27,27-31,31-35,35-39,39- 43,43-47. now the difference between the values of two consecutive class marks is 4, therefore we subtract 4/2 = 2 from each class mark to get the lower limit of the corresponding class interval and add 4 to each class mark to get the upper limit

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