Page 149 - Math Course 2 (Book 2)

Measure of Central Tendency

Let’s Begin OLYMPICS
The line plot shows the number of gold medals
earned by each country that participated in the
2002 Winter Olympic games in Salt Lake City,
Utah. Find the mean, median, and mode for the
Real World Example gold medals won.

MOVIES
The revenue of the 10 highest grossing movies
as of 2004 are given in the table. Find the mean,
median, and mode of the revenues.

Top 10 Movie Revenues(millions of $)
436 249
373 187 0 1 2 3 4 5 6 7 8 9 10 11 12
371 176 6(0)+3(1)+5(2)+3(3)+3(4)+2(6)+1(10)+1(11)+1(12)
279 173 mean = 24 ≈3.16
261 163

Answer The mean is 3.16.
sum of revenues
mean = number of movies
436 + 373 + ... + 163 There are 24 numbers. The median number is the
=
10 average of the 12 and 13 numbers.
th
th
2668
= or 266.8
10
Answer The median is 2.
The mean revenue is $266.8
Answer
million.
The number 0 occurs most frequently in the set of
To find the median, order the numbers from least data.
to greatest.
163, 173, 176, 187, 249, 261, 279, 371, 373, 436
Answer The mode is 0.
249 + 261 = 55
2

There is an even number of items. Find Your Turn!
the mean of the two middle numbers.
Real World Example
The median revenue is $255
million. There is no mode TEST SCORES
Answer The test scores for a class of nine students are 85,
because each number in
the set occurs once 93, 78, 99, 62, 83, 90, 75, 85. Find the mean, median,
and mode of the test scores.

A. mean, 73.9; median, 85; mode, no mode
B. mean, 83.3; median, 85; mode, 85
C. mean, 750; median, 62; mode, 85
D. mean, 83.3; median, 62; mode, 85

Answer

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