Question

the marks obtained by a class of 80 students in a test with maximum marks 100. marks- 0-15 , 15-30 , 30-45 , 45-60 , 60- 75 , above 75
No.of students- 6,13,17,24,16,4,

A students of the class is selected at random. Find the probability that he gets
1. less than 15% marks
2.60 or more marks
3.less than 45 marks

Answer 1

1-16.6

2-6.28

3-5.88

according to me