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