Read the bar graph (Fig 3.4) which shows the number of books sold by a bookstore during five consecutive years and answer the following questions:
(i) About how many books were sold in 1989? 1990? 1992?
(ii) In which year were about 475 books sold? About 225 books sold?
(iii) In which years were fewer than 250 books sold?
(iv) Can you explain how you would estimate the number of books sold in 1989?

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Detailed Solution

(i) From the bar graph:

In 1989, number of books sold is 175.

in 1990, number of books sold is 475.

In 1992, number of books sold is 225.

(ii) About 475 books were sold in 1990 and about 225 books were sold in 1992.

(iii) In 1989 and 1992, fewer than 250 books were sold.

(iv) Scale is given: 1 unit = 100 books

So, $\frac{3}{4} of 100 = 75$

hence, number of books were estimated as:

$100 + 75 = 175$

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