Question

If out of a sample of 180 drivers prefer a standard transmission over automatic , about a standard transmission in a population of 900

A:700
B:22
C:360
D:200

Answer 1

This is a matter of ratio and proportion, let us represent the unknown value as x. Since the two ratios are related,

40 : 180 :::: x : 900

40 / 180 = x / 900

x = (40/180)(900)

x = 200q