Question

The marks obtained (out of 80 marks) by 40 students in a test of mathematics are given in the following table:


Marks obtained


0-20


20-30


30-40


40-50


50-60


60-70


70-80

No. of students
3
2
5
8
6
9
7

Find the probability of a student, chosen at random, getting
Less than 40 marks
50 or more marks ​

Answer 1

Answer:

probability of getting less then 40 marks is 1/4

probability of gettingmore than 50 is 11/20

Step-by-step explanation:

less than 40 marks = number of students got less than 40 marks/ total number of students in the class

=10/40

= 1/4

more than 50 marks= number of trains got more than 50 marks/ total number of students in the class

=22/40

=11/20

hope it helps.....