Page 314 - Algebra 1

L E S S O N Analyzing Measures of Central Tendency 48
Warm Up
1. Vocabulary A possible result in a probability experiment is called
(Inv 1)
Order the numbers from least to greatest.
a(n) .
2. _4 , 1_4 , _3 ,_1_2 , _2 (SB 1) 9 5 8 3 5
4.Simplify 6-3+5. (4) 10 - 2
5. Solve 3x + 7 = 5x + 11. (28)
3. 2.75, 2.59, 2.337, 2.5 (SB 1)
New Concepts
A measure of central tendency is a value that describes the center of a data set. Measures of central tendency include the mean, median, and mode.
The mean is the sum of values in a data set divided by the number of data values.
The median is the middle number in a set of numbers when they are arranged in order. If there is an even number of data values in the set, the median is the mean of the two middle numbers.
The mode is the value or values that occur most frequently in a data set. If all values occur the same number of times, the data set has no mode.
Finding the Mean, Median, and Mode
Find the mean, median, and mode of the values in the data set, rounded to the nearest whole.
35, 36, 33, 38, 36, 34, 35, 35, 33
mean: 35+36+33+38+36+34+35+35+33 ____
Example
1
Hint
Find the mean of the values by finding the average. The median
is the middle number of the values, like the median is the middle stripe on a road. The mode is the value that occurs most frequently.
SOLUTION
Online Connection www.SaxonMathResources.com
The mean of the values is 35.
median: 33, 33, 34, 35, 35, 35, 36, 36, 38
The median is 35.
mode: The number 35 occurs more often than any other number. The mode is 35.
= 315 _
9 = 35
9
Lesson 48 299