The marks obtained by 30 students is given in the following table: Marks 70 58 60 52 65 75 68 No. of Students 3 5 4 7 6 2 3 respectively. Find the Probability that a student secures (i) 60 marks (ii) 75 marks (iii) Less than 60 marks
Answers
Given : the marks obtained by 30 students is given in the following table : marks : 70,58,60,52,65,75,68 no of students :3,5,4,7,6,2,3.
To Find : probability that a student secures (i) 60 marks (ii) 75 marks (iii) less than 60 marks
Solution:
Marks : Number of students
52 7
58 5
60 4
65 6
68 3
70 3
75 2
Total 30
probability that a student secures (i) 60 marks = 4/30
= 2/15
probability that a student secures 75 marks = 2/30
= 1/15
probability that a student secures less than 60 marks = (7 + 5)/30
= 12/30
= 2/5
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