Question

Following table shows the marks scored by a group of 90 students in a mathematic test of 100 marks . Find the probability that a student obtained less than 20 percent marks and 60 or more marks. Marks : number of students = 0-20:7, 20-30:10, 30-40:19, 40-50:20, 50-60:10, 60-70:15, 70-100:9

Answer 1

P(E)= no.of favourable events/total no.of events

so favourable event

for less than 20% marks =(20/100)×100= 20marks

students which got less than 20 marks is 7

total students is 90

P(E) =7/20.......(1)

P(E)for 60 or more marks is 15+9 students=24

favourable number of students is 24 and total number of students is 90 so P(E)is

24/90=4/15

Answer 2

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