Question

The marks obtained(out of 100) by a class of 80 students are given below: A student of the class is selected at random.Find the probability that he/she gets 1. less than 20%,2. 50 or more mark

Answer 1

Step-by-step explanation:

Total number of students = 80 .

(i) P(The student gets less than 15% marks)

= `("number of students getting less than 15 marks")/("total number of students")`

`= (6)/(80) = (3)/(40)` .

(ii) P(The student gets 60 or more marks)

`= ("number of students getting 60 or more marks")/("total number of students")`

= `(16 + 4)/(80) = (20)/(80) = (1)/(4)` .

(iii) P(The student gets less than 45 marks )

= `("number of students getting less than 45 marks")/("total number of students")`

`= (6 + 13 + 17)/(80) = (36)/(80)= (9)/(20)` .