Marks in Mathematics: Highest Marks = 72, Lowest marks = 25,
Difference = 47/(i)l Owidth 5 = 5 (Approx.) classes.
Marks in statistics: Highest marks = 85, Lowest marks = 20,
Difference = 65/(i)10 width = 7 (Approx.) classes.
Let x and y be marks inmathematics and marks in statistics.