The marks (out of 100 ) obtained by a student in his quarterly examination in various subjects are given below: Subjects Telugu Hindi English Maths Science Social Marks obtained 85 74 68 90 75 50 Represent the data in a bar graph

We can draw the bar graph by following the given steps: Step 1 . On a graph paper, draw a horizontal line O X representing x ‐ axis and vertical line O Y representing y ‐ axis. Step 2 . Along O X , write the names of the subjects at the points that are taken at a uniform gap. Step 3 . On O Y choose the scale: 1 small division = 1 Mark Step 4 . On x -axis represents subjects Hence, the above obtained figure is the bar graph for given data.

The percentage of marks obtained by a student in various exams is given below. Represent the data by a line graph Name of the exam UT-1 UT-2 Quarterly UT-3 Half-yearly UT-4 Annual Percentage of marks 50 85 60 80 68 75 70

Name of the exam UT-1 UT-2 Quarterly UT-3 Half-yearly UT-4 Annual Percentage of marks 50 85 60 80 68 75 70 On x -axis exams are represented On y -axis percentage marks are represented Scale on y -axis is 1 cm = 10 marks in percentage

The following table shows the favourite games of 240 students of a school. Draw a pie-chart for following data Games Football Badminton Cricket Volleyball Hockey Number of students 35 30 80 40 55

Given, Games Football Badminton Cricket Volleyball Hockey Number of students 35 30 80 40 55 Central angle = component part total × 360 ° Total = 35 + 30 + 80 + 40 + 55 = 240 Central angle for football = 35 240 × 360 ° = 52 . 5 ° Central angle for badminton = 30 240 × 360 ° = 45 ° Central angle for cricket = 80 240 × 360 ° = 120 ° Central angle for volleyball = 40 240 × 360 ° = 60 ° Central angle for hockey = 55 240 × 360 ° = 82 . 5 °

The following table gives the average temperatures, during the year 2006 and 2007 . Draw a double-bar graph for the given data Month Jan Feb March Apr May June July Aug Sept Oct Nov Dec Temperature (in ° C ) 2006 20 32 36 38 42 35 32 30 28 25 20 15 Temperature (in ° C ) 2007 20 30 40 40 40 35 30 30 25 20 18 15

Given data, Month Jan Feb March Apr May June July Aug Sept Oct Nov Dec Temperature (in ° C ) 2006 20 32 36 38 42 35 32 30 28 25 20 15 Temperature (in ° C ) 2007 20 30 40 40 40 35 30 30 25 20 18 15 The following double graph represents the given data On x-axis, the months of the year from Jan to Dec are represented. Each double bar represents the temperature (in ° C ) in 2006 and 2007 On y-axis, the value of temperature is represented with scale of 1 cm = 5 ° C

MEDIUM

7th CBSE

IMPORTANT

Earn 100

The mean height of a group of $30$ students is $150 cm$ . If a $150 cm$ tall students is included in the group, then find the mean height of the new group.

Important Questions on Statistics

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Mathematics>Chapter 9 - Statistics>PRACTICE QUESTIONS (CLASSROOM WING)>Q 43

The mean of observations

2, 3, 4, 5, 8, 14, x

x

. Find

x

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Mathematics>Chapter 9 - Statistics>PRACTICE QUESTIONS (CLASSROOM WING)>Q 44

In a box, there are

20

marbles. Each marble is marked with a distinct number from

1

20

. Find the probability of drawing a marble from the box which is marked with a number that is perfect square.

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Mathematics>Chapter 9 - Statistics>PRACTICE QUESTIONS (CLASSROOM WING)>Q 45

Find the mean of data

7, 8, 10, 13, 17, 23, 30, 38, 47

and

57

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Mathematics>Chapter 9 - Statistics>PRACTICE QUESTIONS (CLASSROOM WING)>Q 46

Find the median of first

10

multiples of

7

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Mathematics>Chapter 9 - Statistics>PRACTICE QUESTIONS (CLASSROOM WING)>Q 49

The marks (out of $100$ ) obtained by a student in his quarterly examination in various subjects are given below:

Subjects	Telugu	Hindi	English	Maths	Science	Social
Marks obtained	$85$	$74$	$68$	$90$	$75$	$50$

Represent the data in a bar graph

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Mathematics>Chapter 9 - Statistics>PRACTICE QUESTIONS (CLASSROOM WING)>Q 50

The percentage of marks obtained by a student in various exams is given below. Represent the data by a line graph

Name of the exam	UT-1	UT-2	Quarterly	UT-3	Half-yearly	UT-4	Annual
Percentage of marks	$50$	$85$	$60$	$80$	$68$	$75$	$70$

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Mathematics>Chapter 9 - Statistics>PRACTICE QUESTIONS (CLASSROOM WING)>Q 51

The following table shows the favourite games of $240$ students of a school. Draw a pie-chart for following data

Games	Football	Badminton	Cricket	Volleyball	Hockey
Number of students	$35$	$30$	$80$	$40$	$55$

MEDIUM

7th CBSE

IMPORTANT

Pearson IIT Foundation Mathematics>Chapter 9 - Statistics>PRACTICE QUESTIONS (CLASSROOM WING)>Q 52

The following table gives the average temperatures, during the year $2006$ and $2007$ . Draw a double-bar graph for the given data

Month	Jan	Feb	March	Apr	May	June	July	Aug	Sept	Oct	Nov	Dec
Temperature (in $° C$ ) $2006$	$20$	$32$	$36$	$38$	$42$	$35$	$32$	$30$	$28$	$25$	$20$	$15$
Temperature (in $° C$ ) $2007$	$20$	$30$	$40$	$40$	$40$	$35$	$30$	$30$	$25$	$20$	$18$	$15$

The mean height of a group of 30 students is 150 cm. If a 150 cm tall students is included in the group, then find the mean height of the new group.

Important Questions on Statistics

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The mean height of a group of $30$ students is $150 cm$ . If a $150 cm$ tall students is included in the group, then find the mean height of the new group.