(i) What was the patient's temperature at 1 p.m.?
(ii) When was the patient�s temperature 38.5°C?
(iii) The patient's temperature was the same times during the period given. What were two times?
(iv)What was the temperature at 1.30 p.m.? How did you arrive at your answer?
(v) During which periods did the patient�s temperature showed an upwart trend?
Ans. In the graph, we find that the time (in hours) are represented on the x-axis and the temperatee (in °C) are represented on the y-axis. The temperature are any time can be read from the graph exactly in the same way as we read the coordinates of a point. From the graph, we observe that:
(i) The temperature of the patient a: 1 pm 36.5°C.
(ii) The temperature of the patient was 38.5°C at 12 noon.
(iii) The temperature of the patient at 1.30 pm and 2 p.m.
(iv) The temperature of the patient at 1.30 pm was 36.5°C. The point between 1 pm and 2 pm on the x-axis is equidistant from the two points showing 1 pm and 2 pm, so it will represent 1.30 pm. Similarly, the point on the y-axis, between 36°C and 37°C will represent 36.5°C
(v) During the periods 9 am to 10 am, 10 am to 11 am and 2 pm to 3 pm the patients temperature showed an upwards trend.
2. The following lines graph shows the yearly sales 1 figures for a manufacturing company.
(i) What-were the sales in (a) 2002 (b) 2006?
(ii) What were the sales in (a) 2003 (b) 2005?
(iii) Compute the difference between the sales in 2002 and 2006.
(iv) In which year was there the greatest difference between the sales as comapred to its previews year?
Ans. In the graph, we find that the years are presented on the x-axis and the sales (in Rs. crores) on the y-axis. The sales at any time (year) can be read from the graph exactly in the same way as we read the coordinates of a point. From the graph, we observe that:
(i) (a) The sales in the year 2002 is Rs. 4 crore.
(b) The sales in the year 2006 is Rs. 8 crore.
(ii) (a) The sales in the year 2003 is Rs. 7 crore.
(b) The sales in the year 2005 is Rs. 10 crore.
(iii) The difference between the sales in 2002 and 2006 = Rs. 8 crore - Rs. 4 crore = Rs. 4 crore.
(iv) The year in which there was the greatest difference between the sales compared to its previous year is the year 2005.
3. For an experiment in Botany, two different plants, plant A and plant B were grown under similar laboratory conditions. Their heights were measured at the end of each week for 3 weeks. The results are shown by the following graph:
(a) How high was Plant A after (i) 2 weeks (ii) 3 weeks?
(b) How high was Plant B after (i) 2 weeks (ii) 3 weeks?
(c) How much did Plant A grow during the 3rd weeks?
(d) How much did plant B grow from the end of the 2nd week to the end of the 3rd week?
(e) During which week did Plant A grow maximum ?
(f) During which week did Plant B grow least?
(g) Were the two plants of the same height during any week shown here? Specify.
Ans. In the graph, we find that the weeks are represented on the x-axis and the heights (in cm) of two plants A and B on the y-axis. The heights on any week of plants A and B can be read from the graph exactly in the same way as we read the coordinates of a point. From the graph, we observe that:
(a) The height of the plant A after
(i) 2 weeks was 7 cm
(ii) 3 weeks was 9 cm
(b) The height of the plant B after
(i) 2 weeks was 7 cm
(ii) 3 weeks was 10 cm
(c) The plant A gro
