9th Class
Mathematics
Sample Paper
Maths Olympiad Model Test Paper-16
question_answer
Following are the marks obtained (Out of 50) by the students in a class.
Marks
Numbers of Students
10 - 20
8
20 - 30
X
30 - 40
9
40 - 50
6
One student from the class is selected at random. If the probability that his marks is 20 or more but less than 40, is \[\frac{5}{7},\] then the value of x is