QTB – May 2015 – L1 – SB – Q5b – Data Collection Analysis

This question requires calculating the lower and upper quartiles for the age distribution of licensed automobile drivers using cumulative frequency.

Question

The following data gives the distribution by age of licensed automobile drivers in a city in the year 2011:

Age Group	Number of Drivers (in thousands)
14 – 19	5
20 – 25	48
26 – 31	124
32 – 37	205
38 – 43	86
44 – 49	72
50 – 55	53
56 – 61	13

You are required to calculate the lower quartile (Q1) and upper quartile (Q3) of the age of the drivers.

Answer