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Data Handling — MATHS STD 7 — Question

Gujarat BoardEnglish MediumSTD 7MATHSData Handling5 Marks
Question
Study the double bar graph given below and answer the questions that follow
:
$a.$ What information is compared in the above given double bar graph?
$b.$ Calculate the ratio of minimum temperatures in the year $2008$ to the year $2009$ for the month of November.
$c.$ For how many months was the minimum temperature in the year $2008$ greater than that of year $2009$? Name those months.
$d.$ Find the average minimum temperature for the year $2008$ for the four months.
$e.$ In which month is the variation in the two temperatures maximum?
✓

Answer

$a.$ The above double bar graph compares the minimum temperature during the month November to February for the years $2008$ and $2009$.
$b.$ Minimum temperature of November in year $2008 = 18^\circ C$
Minimum temperature of November in year $2009 = 15^\circ C$
$\therefore$ Required ratio $=\frac{18}{15}=18:15=6:5$
$c.$ We can clearly see from the double bar graph that the minimum temperature in the year $2008$ greater than that of the year $2009$ for the month of February and November.
$d.$ Average minimum temperature for year $2008$
$=\frac{\text{Total temperature for year $2008$ in four months}}{4}$
$=\frac{18+11+4+12}{4}$
$=\frac{45}{4}$
$=11.25$
$e.$ Difference of temperature for different months can be shown by following table:
Month
Difference of tempreature
November
$18 - 15 = 3$
December
$12 - 11 = 1$
January
$5 - 4 = 1$
February
$12 - 8 = 4$
From the above table, it is clear that for the month of February variation in two temperatures is maximum.

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