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Use Graph paper for this question.

A survey regarding height (in cm) of 60 boys belonging to Class 10 of a school was conducted. The following data was recorded:

Height in cm |
135-140 | 140-145 | 145-150 | 150-155 | 155-160 | 160-165 | 165-170 |

No. of boys |
4 | 8 | 20 | 14 | 7 | 6 | 1 |

Taking 2 cm = height of 10 cm along one axis and 2 cm = 10 boys along the other axis draw an ogive of the above distribution. Use the graph to estimate the following:

1) the median

2) lower Quartile

3) if above 158 cm is considered as the tall boys of the class. Find the number of boys in the class who are tall.

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