Question

The marks of $30$ students of a class, obtained in a test (out of $75$), are given below:
$42,21,50,37,42,37,38,42,49,52,38,53,57,47,29$
$59,61,33,17,17,39,44,42,39,14,7,27,19,54,51$.
Form a frequency table with equal class intervals.

Answer 1

Marks 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80

class intervals

No of students 1 4 3 7 7 7 1 0

The class intervals 30-40 ,40-50 and 50-60 have equal frequency.