91Ó°ÊÓ

(a) Suppose a manufacturer conducts a study to determine the average retail price being charged for his product in a particular market area. Is such a variable discrete or continuous? (b) In conjunction with the previous study the manufacturer also wants to determine the number of units sold in the area during the week in which an advertising campaign was conducted. Is this variable discrete or continuous?

The IQ scores for a sample of 24 students who are entering their first year of high school are: (a) Make a cumulative percentage graph using classes of seven points starting with \(96-102\). (b) What scores are below the 25 th percentile? (c) What scores are above the 75 th? (d) What is the median score?

A motor car traveled 3 consecutive miles, the first mile at \(\mathrm{x}_{1}=35\) miles per hour (mph), the second at \(\mathrm{x}_{2}=48 \mathrm{mph}\), and the third at \(\mathrm{x}_{3}=40 \mathrm{mph}\). Find the average speed of the car in miles per hour.

Find the median of the sample \(34,29,26,37,31\) and 34 .

What is the value of the median for the numbers \(5,8,12,3,9 ?\)

Given the following set of ungrouped measurements $$ 3,5,6,6,7, \text { and } 9 $$ determine the mean, median, and mode.

Find the variance of the sample of observations \(2,5,7,9,12\).