Question 46
The sixth class interval for a grouped data whose first two class intervals are 10-15 and 15-20 is ___
35-40 From the first two intervals, we can observe that the class size is 5. So, the sixth class interval will be 35 - 40.
Look at the following table below. Class intervalClass mark0−55−1010−1515−20 The class-mark for the first and second class intervals are:
Question 93
The marks obtained (out of 20) by 30 students of a class in a test are as follows : 14, 16, 15, 11, 15, 14, 13, 16, 8, 10, 7, 11, 18, 15, 14, 19, 20, 7, 10, 13, 12, 14, 15, 13, 16, 17, 14, 11, 10, 20. Preparing a frequency distribution table for the above data using class intervals of equal width in which one class interval is 4-8 (excluding 8 and including 4).