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As part of his science project, Prithvi was supposed to record the temperature every hour one Saturday from 6 am to midnight. At noon, he was taking lunch and forgot to record the temperature.

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Question

As part of his science project, Prithvi was supposed to record the temperature every hour one Saturday from 6 am to midnight. At noon, he was taking lunch and forgot to record the temperature. At 8:00 pm, his favourite show came on and so forgot again. He recorded the data so collected on a graph sheet as shown below.

  1. Why does it make sense to connect the points in this situation?
  2. Describe the overall trend, or pattern, in the way the temperature changes over the time period shown on the graph.
  3. Estimate the temperature at noon and 8 pm.
Graph
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Solution

  1. By connecting the points, it is easier to understand a change in the temperature.
  2. Initially the temperature was 8°C at 6 am and started increasing strictly till 1 pm and after that it decreased to 8°C till 12 pm.
  3. At 12 pm 19°C and at 8 pm 10°C.
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Chapter 12: Introduct To Graphs - Exercise [Page 395]

APPEARS IN

NCERT Exemplar Mathematics Exemplar [English] Class 8
Chapter 12 Introduct To Graphs
Exercise | Q 81. | Page 395

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