Notes Unit 8: Mean, Median, Standard Deviation - Conejo Valley Unified ...
Notes Unit 8: Mean, Median, Standard
Deviation
I. Mean and Median
The MEAN is the numerical average of the data set.
The mean is found by adding all the values in the set, then dividing the sum by the number of values.
The MEDIAN is the number that is in the middle of a set of data
1. Arrange the numbers in the set in order from least to greatest.
2. Then find the number that is in the middle.
Ex 1: These are Abby's science test scores. Find the mean and median.
86
97
84
73
63
88
97
100
95
97
84
Lets find Abby's
88
MEAN science test
100
score?
95
63
73
783 ? 9
+
86
97
The mean is 87 783
63 73 84 86 88 95 97 97 100
The median is 88.
Half the numbers are less than the median.
Half the numbers are greater than the median.
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