consider the following distribution find the number of students having marks more than 29 but less than 40

consider the following distribution find the number of students having marks more than 29 but less than 40 Marks
than or 0
Wore than or equal 10
More than equal to 20
More than or equal
More than Or equal to 40
More than or equal '0 50
50
25
Find the number of students having marks more than 29 but less