Given below are the heights (in cm) of ninety children.Prepare a frequency table by grouping their heights into classes of 90 - 95 cm, 95 - 100 cm, 100 - 105 cm, 105 - 110 cm , 110 - 115 cm, 115 - 120 cm. 107 96 108 103 112 106 115 111 115 101 109 113 112 100 109 113 118 104 94 114 99 114 106 114 98 109 107 114 106 107 93 104 103 113 107 94 102 117 116 104 112 101 92 105 104 115 111 103 110 99 108 105 116 109 114 110 97 110 113 116 105 110 109 101 106 108 107 107 101 109 118 102 114 108 94 104 113 102 105 95 99 107 102 98 115 95 106 110 108 105 Also represent the data by histogram.

A frequency table is a table that lists items and shows the number of times the items occur. The frequency table of above data is presented below: Heights (in cm) Frequency 90 - 95 5 95 - 100 9 100 - 105 17 105 - 110 28 110 - 115 21 115 - 120 10 Now we know that a histogram is a display of statistical information that uses rectangles to show the frequency of data items in successive numerical intervals of equal size. The required histogram is as follows:-

The number of students in a hostel speaking different languages is given below: Language English Hindi Punjabi Bengali Urdu Number of students 24 80 18 7 8 Display the above data in a pie chart.

Given, The number of students in a hostel speaking different languages is given below: Language English Hindi Punjabi Bengali Urdu Number of students 24 80 18 7 8 Angle of sector = Value of item Sum of values of items × 360 ° . Now finding the angle of sector for different subjects English= 24 137 × 360 ° = 63.06 ° = 63 ° (approx.) Hindi = 80 137 × 360 ° = 210.21 ° = 210 ° (approx.) Punjabi = 18 137 × 360 ° = 47.29 ° = 47 ° (approx.) Bengali = 7 137 × 360 ° = 18.39 ° = 18 ° (approx.) Urdu = 360 ° - ( 63 ° + 210 ° + 47 ° + 18 ° ) = 22 ° Now representing the above values on a pie chart.

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8th CBSE

IMPORTANT

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The histogram given below depicts the time taken by some students to reach school.

How many students take $40$ minutes or more to reach school?

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Important Questions on Data Handling

EASY

8th CBSE

IMPORTANT

Joy Of Mathematics 8>Chapter 22 - Data Handling>Exercise>Q 4

The histogram given alongside depict the time taken by some students to reach school.

How many students take $20$ minutes or more but less than $40$ minutes?

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8th CBSE

IMPORTANT

Joy Of Mathematics 8>Chapter 22 - Data Handling>Exercise>Q 5

The histogram given alongside is based on the number of hours $30$ students spent outdoors on a Sunday.

What is the size of each class interval?

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8th CBSE

IMPORTANT

Joy Of Mathematics 8>Chapter 22 - Data Handling>Exercise>Q 5

The histogram given alongside is based on the number of hours $30$ students spent outdoors on a Sunday.

How many students spent less than an hour outdoors?

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EASY

8th CBSE

IMPORTANT

Joy Of Mathematics 8>Chapter 22 - Data Handling>Exercise>Q 5

The histogram given alongside is based on the number of hours

30

students spent outdoors on a Sunday.

Which interval of time were the largest number of students present outdoors?

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8th CBSE

IMPORTANT

Joy Of Mathematics 8>Chapter 22 - Data Handling>Exercise>Q 5

The histogram given alongside is based on the number of hours $30$ students spent outdoors on a Sunday. How many students spent more than four hours outdoors?

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8th CBSE

IMPORTANT

Joy Of Mathematics 8>Chapter 22 - Data Handling>Exercise>Q 5

The histogram given alongside is based on the number of hours $30$ students spent outdoors on a Sunday.

How many students spent more than three hours outdoors?

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MEDIUM

8th CBSE

IMPORTANT

Joy Of Mathematics 8>Chapter 22 - Data Handling>Exercise>Q 6

Given below are the heights (in cm) of ninety children.Prepare a frequency table by grouping their heights into classes of $90 - 95$ cm, $95 - 100$ cm, $100 - 105$ cm, $105 - 110$ cm $, 110 - 115$ cm, $115 - 120$ cm.

$107$	$96$	$108$	$103$	$112$	$106$	$115$	$111$	$115$	$101$	$109$	$113$	$112$	$100$	$109$
$113$	$118$	$104$	$94$	$114$	$99$	$114$	$106$	$114$	$98$	$109$	$107$	$114$	$106$	$107$
$93$	$104$	$103$	$113$	$107$	$94$	$102$	$117$	$116$	$104$	$112$	$101$	$92$	$105$	$104$
$115$	$111$	$103$	$110$	$99$	$108$	$105$	$116$	$109$	$114$	$110$	$97$	$110$	$113$	$116$
$105$	$110$	$109$	$101$	$106$	$108$	$107$	$107$	$101$	$109$	$118$	$102$	$114$	$108$	$94$
$104$	$113$	$102$	$105$	$95$	$99$	$107$	$102$	$98$	$115$	$95$	$106$	$110$	$108$	$105$

Also represent the data by histogram.

EASY

8th CBSE

IMPORTANT

Joy Of Mathematics 8>Chapter 22 - Data Handling>Exercise>Q 7

The number of students in a hostel speaking different languages is given below:

Language	English	Hindi	Punjabi	Bengali	Urdu
Number of students	$24$	$80$	$18$	$7$	$8$

Display the above data in a pie chart.

The histogram given below depicts the time taken by some students to reach school. How many students take 40 minutes or more to reach school?

Important Questions on Data Handling

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The histogram given below depicts the time taken by some students to reach school.

How many students take $40$ minutes or more to reach school?