Page 332 - Start Up Mathematics_8 (Non CCE)

EXERCISE 21.1

1. Draw a histogram to represent the following data of the heights of 60 boys of a school:

Height (in cm) 125–130 130–135 135–140 140–145 145–150

No. of boys 12 14 18 10 6

2. The following is the distribution of weights (in kg) of 50 persons:

Weight (in kg) 40–45 45–50 50–55 55–60 60–65 65–70

No. of persons 10 8 10 4 6 12

Draw a histogram for the above data and answer the following questions:
(a) Which is the group with maximum number of
persons?
(b) What is the class size?
(c) Which is the group with minimum number of
persons?
Y
3. The given histogram depicts the earnings of
70 chemists. 25
Study the histogram and answer the following 20
questions: Number of chemists 15
(a) What is the class size? 10
5
(b) Which is the group with maximum earnings? X
0 20 40 60 80 100 120
(c) Which is the group with minimum earnings? Daily earnings
(d) How many chemists earn less than ` 60 per day? (in `)

4. Study the given histogram and answer the
questions that follow. Y
(a) What information is depicted in the above
histogram? 1000
900
(b) In which age group is the number of literate 800
females maximum? 700
(c) In which age group is the number of literate 600
females minimum? 500
(d) What is the width of each class interval? Number of literate females 400
300
(e) What are the class marks of the intervals 200
15–20, 25–30 and 40–45? 100
(f) How many females below 30 years of age 0 X
are literate? 10 15 20 25 30 35 40 45
Ages (in years)

324