The following table gives the life times of 400 neon lamps: | Life time (in hours) | Number of lamps | |----------------------|-----------------| | 300 - 400 | 14 | | 400 - 500 | 56 | | 500 - 600 | 60 | | 600 - 700 | 86 | | 700 - 800 | 74 | | 800 - 900 | 62 | | 900 - 1000 | 48 | (i) Represent the given information with the help of a histogram. (ii) How many lamps have a life time of more than 700 hours?

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CASE_STUDIESHistogram for Grouped DataNCERT Textbook2 sub-questions

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The length of 40 leaves of a plant are measured correct to one millimetre, and the obtained data is represented in the following table: | Length (in mm) | Number of leaves | |----------------|------------------| | 118 - 126 | 3 | | 127 - 135 | 5 | | 136 - 144 | 9 | | 145 - 153 | 12 | | 154 - 162 | 5 | | 163 - 171 | 4 | | 172 - 180 | 2 | (i) Draw a histogram to represent the given data. [Hint: First make the class intervals continuous] (ii) Is there any other suitable graphical representation for the same data? (iii) Is it correct to conclude that the maximum number of leaves are 153 mm long? Why?

CASE_STUDIESHistogram for Grouped Data

Is it correct to say that in a histogram, the area of each rectangle is proportional to the class size of the corresponding class interval? If not, correct the statement.

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