Question

(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.
Refer to Table 14.7, Chapter 14.

Answer 1

Total number of students = 90

Total number of students that scored less than 20 marks = 7

P(less than 20 marks) = 7/90

Total number of students that scored 60 marks and more = 15 + 8 = 23

P(60 marks and more) = 23/90

Answer: (i) 7/90 (ii) 23/90

Answer 2

Given :

Total number of students = 90

1)

Number of students obtained less than 20 marks are 7 members

Probability less than 20 marks = 7/90

2)

Number of students obtained 60 marks or above are

15 + 8 = 23 members

Probability 60 marks or above = 23/90 .

$\bold{Answer: (1) \: 7/90 \: \: (2) \: 23/90}$