The marks obtained (out of 80 marks) by 40 students in a test of mathematics are given in the following table:
Marks obtained
0-20
20-30
30-40
40-50
50-60
60-70
70-80
No. of students
3
2
5
8
6
9
7
Find the probability of a student, chosen at random, getting
Less than 40 marks
50 or more marks
Answers
Answered by
5
Answer:
number of students who got marks less than 40: 10
total number of students: 40
probability of getting less than 40: 10/40 = 1/4
number of students who got marks greater than 50: 22
probability: 22/40 = 11/20
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1
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