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UI Post-UTME Geography 2017 (Model questions) Question 9

Question 9

Weather

How is the mean annual rainfall of a given place calculated using records for 35 years?

  1. A.by summing the yearly average rainfall figures and dividing by 35
  2. B.by summing the yearly total rainfall figures and dividing by 35
  3. C.by summing the yearly total rainfall figures for 35 years and dividing by 12
  4. D.by finding the average between the figures for the wettest and the driest years and multiplying by 35
  5. E.by plotting the rainfall figures on a graph and finding the midpoint.
Show the answer and explanation

Answer: B (by summing the yearly total rainfall figures and dividing by 35)

Explanation

Add the 35 annual totals and divide by 35 to get the average yearly rainfall.