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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 year 1990 =475 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 most popular pet is Cat. It is... 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 false Calculation of mean Mean = Sum of all given... 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 value of 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 may not be one of the... 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 the variable... 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 = 12, 12, 13, 13, 14, 14, 14, 16,... 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 given weights 15 students of a class in... 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 cricket match by 11 players in ascending... 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 the given scores in ascending order, we 5,... 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 in ascending order 128, 132, 135, 139,... 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 given data... View Article

Archives

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?

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

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

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

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

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

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?

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?

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?

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.

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