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S.chand books class 8 maths solution chapter 29 Graphical Representation of Data exercise 29 B

EXERCISE 29 B
1.Represent the following distribution of ages (in years) of 35 teachers in a school by means of a histogram.
<div style=”overflow: auto;”>
<table style=”border-collapse: collapse;” border=”1″>
<tr><th>Age(in years)</th><td>25-30</td><td>30-35</td><td>35-40</td><td>40-45</td><td>45-50</td></tr>
<tr><th>Number of teachers</th><td>12</td><td>11</td><td>8</td><td>1</td><td>3</td></tr>
</table>
</div>

Draw histrograms for the following frequency distributions.
2.
<div style=”overflow: auto;”>
<table style=”border-collapse: collapse;” border=”1″>
<tr><th>Size</th><td>0-10</td><td>10-20</td><td>20-30</td><td>30-40</td><td>50-60</td></tr>
<tr><th>Frequency</th><td>5</td><td>10</td><td>20</td><td>25</td><td>20</td><td>10</td></tr>
</table>
</div>

3.
<div style=”overflow: auto;”>
<table style=”border-collapse: collapse;” border=”1″>
<tr><th>Class interval</th><td>0-5</td><td>5-10</td><td>10-15</td><td>15-20</td><td>20-25</td></tr>
<tr><th>Frequency</th><td>10</td><td>25</td><td>9</td><td>20</td><td>5</td></tr>
</table>
</div>

4.
<div style=”overflow: auto;”>
<table style=”border-collapse: collapse;” border=”1″>
<tr><th>Marks</th><td>0-10</td><td>10-20</td><td>20-30</td><td>30-40</td><td>40-50</td></tr>
<tr><th>Number of students</th><td>5</td><td>9</td><td>14</td><td>7</td><td>5</td></tr>
</table>
</div>

5.For the histogram shown alogside.
(i) What is the total number of students over whom our study has been conducted ?
(ii) Which time interval has the maximum number of students studying ?
(iii) Which time interval has the minimum number of students studying?
(iv) How many times is the number of students in the time interval 3hours – 6 hours greater than the number of students in the time interval 9 hours – 12 hours?

6. For the histogram given alongside answer the questions that follow.
(i) What is the total number of girls in the class?
(ii) Which group contains the maximum number of girls?
(iii) Which groups have the minimum number of girls and how many ?
(vi) How many girls have a height of 145 cm or more ?

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