: Find the number of students who obtained marks between 60 and 70 from the following
Answers
Answered by
0
Answer:
(i) Total number of student in a class, n(S)=90
The number of student obtained less than 20% marks lies in the interval 0−20, i.e., n(E)=7
∴ The probability, that a student obtained less than 20% marks in the methematics test
=n(E)n(S)=790
(ii) The number of students obtained marks 60 or above lies in the marks interval 60-70 and 70-above, i.e., n(F)=15+8=23.
∴ The probability that a student obtained marks 60 or above =n(F)n(S)=239
Similar questions