In a public library, the following observations were recorded by the librarian in a particular week:
(a) Draw a double bar graph choosing an appropriate scale.
(b) On which day, the number of readers in the library was maximum?
(c) What is the mean number of magazine readers?
Solution:
Given, the table represents the observations recorded by the librarian in a public library in a particular week.
(a) We have to draw a double bar graph choosing an appropriate scale.
(b) We have to find the day in which the number of readers in the library was maximum.
Number of readers on Monday = 400 + 150 = 550
Number of readers on Tuesday = 600 + 100 = 700
Number of readers on Wednesday = 350 + 200 = 550
Number of readers on Thursday = 550 + 300 = 850
Number of readers on Friday = 500 + 250 = 750
Number of readers on Saturday = 350 + 200 = 550
Therefore, on Thursday the number of readers was maximum.
(c) We have to find the mean number of magazine readers.
We know, mean = sum of all observations/number of observations
Sum of all observations = 150 + 100 + 200 + 300 + 250 + 200
= 1200
Number of observations = 6
Mean = 1200/6
= 200
✦ Try This: The data given below shows the production of motor bikes in a factory for some months of two consecutive years.
| Months | January | February | March | April | May |
| 2009 | 3000 | 4000 | 3400 | 3300 | 5600 |
| 2008 | 4500 | 3500 | 4600 | 3200 | 5400 |
Study the table given above and answer the following questions: Find the mean production for the year 2009.
☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 3
NCERT Exemplar Class 7 Maths Chapter 3 Problem 82
In a public library, the following observations were recorded by the librarian in a particular week: (a) Draw a double bar graph choosing an appropriate scale. (b) On which day, the number of readers in the library was maximum? (c) What is the mean number of magazine readers
Summary:
(a) The double bar graph for the given data is mentioned above, (b) On Thursday, the number of readers in the library was maximum, (c) The mean number of magazine readers is 200
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