Question

Construct a histogram of the following distribution of height of students of class VIII-E.

Height in cm (Class Marks)	120	130	140	150	160	170
No. of student	8	10	14	12	6	2

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

We have to first calculate the class interval from the class marks.

Difference between the two successive classes = h = 130 - 120 =10.

If x is the class marks then, lower and upper boundary of every class is x - $\frac{h}{2}$ and x + $\frac{h}{2}$.

Class marks (Ages)	Frequency (No. of students)	Class intervals
120	8	115 - 125
130	10	125 - 135
140	14	135 - 145
150	12	145 - 155
160	6	155 - 165
170	2	165 - 175

Take suitable scale ,
On X-axis 1 cm = 1 class interval
On Y-axis 1 cm = 2 students

Take class intervals on X-axis and frequency on Y-axis.

Now, plot the bar in the graph with respect to the class interval.