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Take the data giving the minimum and the maximum temperature of various cities given in the beginning of this Chapter (Table 3.1). Plot a double bar graph using the data and answer the following: (i) Which city has the largest difference in the minimum and maximum temperature on the given date? (ii) Which is the hottest city and which is the coldest city? (iii) Name two cities where maximum temperature of one was less than the minimum temperature of the other. (iv) Name the city which has the least difference between its minimum and the maximum temperature.

Solution (i) From the double graph drawn we get to know that, Jammu has the largest difference in the minimum... View Article

Consider this data collected from a survey of a colony. (i) Draw a double bar graph choosing an appropriate scale. What do you infer from the bar graph? (ii) Which sport is most popular? (iii) Which is more preferred, watching or participating in sports?

Favourite Sport Cricket Basket Ball swimming Hockey Athletics Watching 1240 470 510 430 250 Participating 620 320 320 250 105... View Article

The performance of a student in 1st Term and 2nd Term is given. Draw a double bar graph choosing appropriate scale and answer the following. (i) In which subject, has the child improved his performance the most? (ii) In which subject is the improvement the least? (iii) Has the performance gone down in any subject?

Subject English Hindi Maths Science S. Science 1st Term (M.M. 100) 67 72 88 81 73 2nd Term (M.M. 100)... View Article

Number of children in six different classes are given below. Represent the data on a bar graph. (a) How would you choose a scale? (b) Answer the following questions: (i) Which class has the maximum number of children? And the minimum? (ii) Find the ratio of students of class sixth to the students of class eight.

Class Fifth Sixth Seventh Eighth Ninth Tenth Number of Children 135 120 95 100 90 80 Solution:- (a) We will consider... View Article

Read the bar graph (Figure) 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?

Solution (i) From the bar graph, we observe that Books sold in the year 1989= 175 Books sold in the... View Article

Use the bar graph (Figure) to answer the following questions. (a) Which is the most popular pet? (b) How many students have dog as a pet?

Solution The bar graph depicts the pets owned by the students. (a) From the bar graph, we observe that The... View Article

The data 6, 4, 3, 8, 9, 12, 13, 9 has mean 9. (True or False)

The data 6, 4, 3, 8, 9, 12, 13, 9 has a mean of 9. Solution The given statement is... View Article

The median is always one of the numbers in a data. (True or False)

The median is always one of the numbers in the data. Solution The given statement is true. Since the median is the... View Article

The mean is one of the numbers in a data. (True or False)

The mean is one of the numbers in the data. Solution The given statement is false. Since mean is may be or... View Article

The mode is always one of the numbers in a data. (True or False)

The mode is always one of the numbers in data. Solution The given statement is true. Since Mode is the value of... View Article

Find the mode and median of the data: 13, 16, 12, 14, 19, 12, 14, 13, 14

13, 16, 12, 14, 19, 12, 14, 13, 14 Solution Let us first arrange the given data in an ascending order... View Article

The weights (in kg.) of 15 students of a class are: 38, 42, 35, 37, 45, 50, 32, 43, 43, 40, 36, 38, 43, 38, 47 (i) Find the mode and median of this data. (ii) Is there more than one mode?

38, 42, 35, 37, 45, 50, 32, 43, 43, 40, 36, 38, 43, 38, 47 Solution Let us first arrange the... View Article

The runs scored in a cricket match by 11 players is as follows: 6, 15, 120, 50, 100, 80, 10, 15, 8, 10, 15 Find the mean, mode and median of this data. Are the three same?

6, 15, 120, 50, 100, 80, 10, 15, 8, 10, 15 Solution Let us first arrange the runs scored in a... View Article

The scores in mathematics test (out of 25) of 15 students is as follows: 19, 25, 23, 20, 9, 20, 15, 10, 5, 16, 25, 20, 24, 12, 20 Find the mode and median of this data. Are they same?

19, 25, 23, 20, 9, 20, 15, 10, 5, 16, 25, 20, 24, 12, 20 Solution Let us first arrange... View Article

The heights of 10 girls were measured in cm and the results are as follows: 135, 150, 139, 128, 151, 132, 146, 149, 143, 141. (i) What is the height of the tallest girl? (ii) What is the height of the shortest girl? (iii) What is the range of the data? (iv) What is the mean height of the girls? (v) How many girls have heights more than the mean height.

135, 150, 139, 128, 151, 132, 146, 149, 143, 141. Solution Let us first arrange the given set of data... View Article

The rainfall (in mm) in a city on 7 days of a certain week was recorded as follows. (i) Find the range of rainfall in the above data. (ii) Find the mean rainfall for the week. (iii) On how many days was the rainfall less than the mean rainfall.

Day Mon Tue Wed Thurs Fri Sat Sun Rainfall(in mm) 0.0 12.2 2.1 0.0 20.5 5.5 1.0 Solution From the... View Article

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