Data Interpretation – To compare the rainfall data, India Meteorological
Slot – 2 – DI
To compare the rainfall data, India Meteorological – Video Solution
To compare the rainfall data, India Meteorological Department (IMD) calculated the Long
Period Average (LPA) of rainfall during period June-August for each of the 16 states. The
figure given below shows the actual rainfall (measured in mm) during June-August, 2019 and
the percentage deviations from LPA of respective states in 2018. Each state along with its
actual rainfall is presented in the figure.
Q.1 If a ‘Heavy Monsoon State’ is defined as a state with actual rainfall from June-August,
2019 of 900 mm or more, then approximately what percentage of ‘Heavy Monsoon
States’ have a negative deviation from respective LPAs in 2019?
42.86
75.00
14.29
57.14
Answer: 1
Q.2 If a ‘Low Monsoon State’ is defined as a state with actual rainfall from June-August,
2019 of 750 mm or less, then what is the median ‘deviation from LPA’ (as defined in the
Y-axis of the figure) of ‘Low Monsoon States’?
10%
-20%
-10%
-30%
Answer: 3
Q.3 What is the average rainfall of all states that have actual rainfall of 600 mm or less in
2019 and have a negative deviation from LPA?
500 mm
460 mm
367 mm
450 mm
Answer: 2
Q.4 The LPA of a state for a year is defined as the average rainfall in the preceding 10
years considering the period of June-August. For example, LPA in 2018 is the average
rainfall during 2009-2018 and LPA in 2019 is the average rainfall during 2010-2019. It is
also observed that the actual rainfall in Gujarat in 2019 is 20% more than the rainfall in
2009. The LPA of Gujarat in 2019 is closest to?
490 mm
525 mm
475 mm
505 mm
Answer: 1
Solution:
Negative deviation as well as rainfall greater than 900 are Arunachal, Kerala, Meghalaya
Rainfall greater than 900 and positive deviations are Maharashtra, Mizoram, Sikkim, Goa
Hence % = 3/7 x 100 = 42.86
As we have a total of 9 states with low monsoon and 5 states with negative deviation among them, the state of assam will have the median value = -10%
As We can see that there are 5 states (Asam, WB, Jharkhand, Delhi and Manipur ) with rainfall less than 600 and negative deviation.
So Required Average of states with rainfall less than 600 and negative deviation is (600 + 600 + 400 + 300 + 400)/5 = 460
Gujrat in 2018 has rainfall of 600 anad deviation of 25% and 2019 is 20% more than 2009  2009 rainfall is 600/1.2 = 500mm.
As deviation is +25% so average 2009 – 2018 is 600/1.25 = 480
LPA 2019 = (480×10 – 500 + 600 )/10 = 490mm