Question

The marks obtained by 90 students of a school in Mathematics out of 100are given below: (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. Marks 0 - 20 20 - 30 30 - 40 40 - 50 50 - 60 60 - 70 70 - above Total No. of students 7 10 10 20 20 15 8 90 ​

Answer 1

For the first question could you tell me how many students hade a Mark less that 20%