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Question

# Construct a histogram from the following distribution of total marks obtained by 60 students of class VIII. Class Marks (Mid points)Number of studentsClass Interval150716014170918012190152003

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Solution

## As class marks (mid points) are given, class intervals are to be calculated from the class marks. Step 1: Find the difference between two successive classes. h = 160 -150 = 10 Step 2: Calculate lower and upper boundaries of every class with class mark x, as x–h2 and x+h2. Step 3: Choose a suitable scale. X-axis 1 small division = 2.5 units and on Y-axis 1 small division = 1 unit. Step 4: Draw rectangles with class intervals as bases and the corresponding frequencies as the heights. Class Marks (Mid points)Number of studentsClass Interval1507145−15516014155−1651709165−17518012175−18519015185−1952003195−205

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