Question

Following table shows the marks scored by a group of 90 students in a

mathematics test of 100 marks. Marks. Number of Students

0-20. 7

20-30. 10

30-40. 10

40-50. 20

50-60. 20

60-70. 15

70-100. 8

Find the probability that a student obtained:

(i) less than 20% marks

(ii) 60 or more marks​

Answer 1

Answer:

(i) 7/90, because only 7 students got below 20% of marks

(ii)15/90, because 15 students got 60 or above.

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