Tuesday, January 29th
1.) Collect homework
2.) Math Minute
3.) Measures of Center & Spread
4.) March 2nd- Math Competition?
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Measures of Central Tendency:
Mean, median, and mode
Measure of Spread:
Range
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MEAN- the "average" of a
set of numbers
To find the mean, add all
the numbers and then
divide by the number of
addends.
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MEDIAN-the middle number
when a set of data is in order
To find the median- put the
data in order and then find
the middle number. If you
have an even number of
items, find the mean of the
middle two numbers.
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MODE- the number or
numbers that appear the
most frequently.
To find the mode, find the
number or numbers that
occur more than the others.
If all numbers occur the
same number of times,
there is no mode.
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Range- the difference
between the greatest and
the least numbers in the
data.
To find the range,
subtract the least number
from the greatest number.
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Which measure of central tendency is the greatest?
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Which measure of central tendency is the greatest?
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On page 378, find the the measures of central tendency and the measure of spread for the line plot shown. On page 379, determine the measures of
central tendency and the measure of
spread for the stem-and-leaf plot shown.
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On page 378, find the the measures of central tendency and the measure of spread for the line plot shown. mean- 6.05 (109 divided by 18)
median- 5 (halfway between 5 & 5)
mode- 5 (appears 4 times, everything
else appears 3 times or less)
range- 14
(16 - 2)
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On page 378, find the the measures of central tendency and the measure of spread for the line plot shown. On page 379, determine the measures of
central tendency and the measure of
spread for the stem-and-leaf plot shown.
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On page 379, determine the measures of
central tendency and the measure of spread
for the stem-and-leaf plot shown.
mean- 15 (180 divided by 12)
median- 16.5 (halfway between 15 & 18)
mode- 18 (appears 3 times, everything else
appears once or twice)
range- 27
(31 - 4)
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Find the measures of central tendency and spread:
16, 28, 75, 19, 24,
29, 25, 17, 36, 19
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16 17 19 19 24 25 28 29 36 75
Mean- 28.8
Median- 24.5
Mode- 19
Range- 59
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There are 7 whole numbers in a
set of numbers. The least
number is 10 and the greatest
number is 20. The median is 16
and the mode is 12. The mean
is 15. What are the numbers?
34
There are 7 whole numbers in a
set of numbers. The least
number is 10 and the greatest
number is 20. The median is 16
and the mode is 12. The mean
is 15. What are the numbers?
35
Twelve girls were in a race.
Their mean time was 11.6
seconds. Eleven of their
times,in seconds, are given in
the table. What was the missing
time?
11.3
12.0
11.5
13.1
10.2
11.7
12.6
10.9
11.3
11.3
12.4
?
36
Over five games,
Maria's bowling average
was 120. On her next
game, she bowled a
132! What is her new
average?
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