Mathematics
The frequency Polygon shown depicts the monthly rainfall in the Kathmandu (Nepal).
Answer the following :
(i) Which month had the highest rainfall?
(ii) How many months had rainfall above 200 mm ?
(iii) How many months had rainfall below 100 mm ?
(iv) Calculate the Mean rainfall in the months from June to September.
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Answer
(i) Highest point on the graph is in July.
Hence, July month had the highest rainfall.
(ii) Months with rainfall above 200 mm are:
June, July and August.
Hence, there are 3 months with rainfall above 200 mm.
(iii) Months with rainfall below 100 mm are :
Jan, Feb, March, April, Oct, Nov and Dec.
Hence, there are 7 months with rainfall below 100 mm.
(iv) Rainfall from June to September are:
Jun (250 mm)
Jul (375 mm)
Aug (350 mm)
Sep (150 mm)
Mean =
= .
Hence, mean rainfall from June to September = 281.25 mm.
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