JAMB - Geography (1982 - No. 21)
How is the mean annual rainfall of a given place calculated using records for 35 years?
by summing the yearly average rainfall figure and dividing by 35
by summing the yearly total rainfall figures dividing by 35
by summing the yearly total rainfall figures for 35 years and dividing by 12
by finding the average between the figures for the wettest and the the direst years and multiplying by 35
by plotting the rainfall figures on a graph and finding the midpoint