7.
The histogram given alongside shows the distribution of ages (in years) of
38 teachers in a school. Answer the following questions.
i. What is the most common age group? How many teachers are there in
this group?
ii. What is number of teachers who are more than 25 years old but less
than 30?
iii. How many teachers are 40 or older?
iv. What is the class size?
Number of teachers -->
6
S
2
25
30
Ages (in years) -
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Answer:
The class limits are represented along the x-axis on a suitable scale and the frequencies are represented along the y-axis on a suitable scale. Taking class intervals as bases and the corresponding frequencies as heights, the rectangles can be constructed to obtain the histogram of the given frequency distribution as shown in the figure below:
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