Question

Following table shows the performance of two sections of students in Mathematics test of 100 marks.

(i) Find the probability that a student obtained less than 20% in the mathematics test. 

(ii) Find the probability that a student obtained marks 60 or above.

Answer 1

(i) Total no. of students = 90 

P (a student obtained less than 20%) = No. of students who obtained less than 20% /Total no. of students 

= 7 / 90

(ii) P (a student obtained 60 marks or above) = No. of students who obtained 60 marks or more/ Total number of students 

= (15+ 8) / 90 = 23 / 90