Question

What is the expression used for population forecasting by the arithmetical increase method?

(a) PO (1 + R/100)^n

(b) PO + n*x

(c) PO + n*x + ( n(n+1)/2 )*y

(d) PO – n*x

This question was addressed to me during a job interview.

My enquiry is from Population Forecasting topic in portion Water Demand and Quantity of Environmental Engineering

Answer 1

Correct answer is (b) PO + n*x

Easy explanation: The expression of the arithmetical increase method is given by PO+n*x, where PO is the present population, x is the average of the population increase in known decade and n is the number of decades.