Unit 3 Section 1 Measure of Central Tendency.notebook
Measures of Central Tendency
Unit 3
December 18, 2015
Measures of Central Tendency
Mean: the average
Median: the middle number when the numbers are in
chronological order
Mode: the value that occurs most often
Nov 29­10:28 AM
Nov 29­10:29 AM
Find the mean, median and mode of the data.
Consider this set of test score values:
1) Test Scores: 6 0 4
7 1 6 7
8 3 3 9 9 9
9 2 2 5 8 8
Set A: 75, 77, 77, 84, 86, 89, 90, 92, 95
Set B: 0, 75, 77, 77, 84, 86, 89, 90, 92, 95
Calculate the Mean, Median and Mode for each set.
2)
They are identical except for the first score. Set B
shows what would happen if one of the scores was WAY
out of range. Such a term is called an outlier.
X
X
X
X X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1 2 3 4 5 6 7
8
9 10 11 12
X
X
X
X
What did the outlier in Set B do to your mean and your median?
Median:
Mean:
Nov 29­10:32 AM
Measures of Central Tendency
3.) The heights of the five starting players on a basketball team are 75 in., 74 in., 73 in., 70 in., and 68 in. Decide which measure of central tendency describes this data well.
Dec 27­8:27 PM
6.) Jaeden's grades on his daily math homework were 8, 10, 7, 9, 9, 4, 8, 2, 10, 8, 3, 7, 9, 8, 6, and 4. Which measure of data is NOT represented by a score of 8?
A. Mean
B. Median
C. Mode
D. Range
7.) Hazel bought 4 burritos for $15. She later bought another burrito for $2.50. What was the mean cost of all the burritos?
A. $3.15
4.) At the end of winter, the seven sweaters left in stock at Natalie's Outlet Store were brown, orange, orange, green, brown, orange and orange. Decide which measure of central tendency is appropriate for this data. B. $3.50
C. $3.75
D. $12.50
8.) Tyra needs an average score of 92 on five quizzes to earn an A. The mean of her first four scores was 91. What is the lowest score that she can receive on the fifth quiz to earn an A?
5). The profits at five schools that sold Gem's and Jewels products were $318, $440, $607, $1090, and $4790. Decide which measure of central tendency is appropriate for these data. Dec 27­8:27 PM
Dec 27­8:27 PM
1
Unit 3 Section 1 Measure of Central Tendency.notebook
December 18, 2015
1. Andrew has taken an aptitude test 8 times and his scores are 96, 98, 98, 105, 36, 87, 95, and 93. Which measure of central tendency is most appropriate for his scores?
a) median
b) mode
c) mean
d) range
2. Which measure of central tendency is most appropriate for a data that describes the heights of grade 5 students?
a) mode
b) outlier
c) mean
d) median
Homework:
3. The data shown are the grades received by fifteen students of Mrs. William's class.
Homework Packet
pages 2, 3
A, B, B, B, C, A, B, B, A, B, C, B, B, B, A
Which measure of central tendency is the best for the given situation?
a) mean
b) mode
c) range
d) median
4. A survey was conducted by a chocolate manufacturing company, about the likes and dislikes of the flavors they marketed. Which measure of central tendency will help them most to make their choice of the most liked flavor?
a) mean
b) range
c) mode
d) median
5. The temperature received till Friday was 94, 98, 86, 90 and 91. If the temperature on Saturday drops to 61oF, how does the inclusion of Saturday's temperature affect the weekly mean temperature?
a) increases
b) decreases
c) does not change
d) can not be determined
6. What effect will the outlier have on the median of the data if the outlier is excluded?
4, 6, 3, 4, 3, 6, 24
a) insufficient information to conclude
b) increases
c) decreases
d) does not change
7. The points scored by a football team are shown in the stem and leaf plot below.
0 6
1 2 3 4 7
2 0 3 4 4 7 8 8 8
3 0 7 8 What was the median number of points scored by the football team?
a) 24
b) 27
c) 28
d) 32
Dec 12­2:30 PM
Dec 27­9:27 PM
Dec 12­3:17 PM
2