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Question
If the normal annual precipitation at station X, A, B and C are 700 mm, 1000 mm, 900 mm and 800 mm respectively and the storm precipirtation at three stations A, B and C were 100 mm, 90 mm and 80 mm respectively. What will be the storm precipitation for station X? 
;fn LVs'ku X, A, B vkSj C ij lkekU; okf"kZd o"kkZ Øe'k% 700 feeh] 1000 feeh] 900 feeh vkSj 800 feeh gS vkSj rhu LVs'kuksa A, B vkSj C ij rwiQku o"kkZ Øe'k% 100 feeh] 90 feeh vkSj 80 feeh FkhA LVs'ku X ds fy, rwiQkuh o"kkZ D;k gksxh
A.
70 mm
B.
80 mm
C.
90 mm
D.
105 mm
Answer ( Option A)

70 mm

Solution

Normal Annual Precipitations,
NX=700 mm, NA=1000 mm, NB=900 mm NC=800 mm
PA=100 mm, PB=90 mm, PC=80 mm
NX varies more than 10% from NA, NB & NC. 
So using normal ratio method,

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