Q. 815.0( 1 Vote )

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 again. He recorded the data so collected on a graph sheet as shown below.

A) Why does it make sense to connect the points in this situation?

B) Describe the overall trend, or pattern, in the way the temperature changes over the time period shown on the graph.

C) Estimate the temperature at noon and 8 pm.

Class 8th NCERT - Mathematics Exemplar 12. Introduction to Graphs

Answer :

A) To observe change in the data over a period of time, we plot a graph and join the points.

B) We can see from the graph that temperature increases from 8°C at 6 am to 21°C at 1 pm (between 12 noon and 2 pm, we can say that temperature is approximately 21°C) and then it decreases to around 9°C at 9 pm(between 8 pm and 10 pm in the graph). It remains constant for an hour (9 pm to 10 pm) and then decreases. We observe that at 12 pm the temperature is 8°C, same as it was at 6 am. Thus, we see that temperature first increases and then decreases from 6 am to 12 pm.

C) On looking carefully at the graph, we see that temperature is around 17°C at 11 am and thus, it is 19°C at 12 noon.

At 8 pm temperature is 10°C.

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