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Ed took 5 tests and his average was 85. If his average after the first three tests was 83, what’s the average of the last two tests.
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On Thursday, 20 out of 25 students took a test and their average was 80. On Friday, the other 5 students took it and their average was 90. What was the class average?
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Finishing Mean/Median
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Examples Average salaries of professional football
players.
Scores on a test when there’s one that hasn’t been made up yet.
Average salaries of 1st year teachers
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mod
mean
median
e
mode median mean
modmean median e
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Boxplots
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Boxplots
Provides information about the center, spread, and symmetry (skewness) of the data.
Multiple boxplots can be used to compare data.
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Constructing a boxplot.
Find the five number salary Minimum Q1
Median Q3
Maximum Plot on number line. Box in the IQR and draw whiskers to
the min & max.
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5, 8, 13, 17, 22, 24, 25, 27, 29, 30
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8, 10, 22, 24, 25, 25, 26, 27, 45, 72
Graph & Describe
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Outlier
A value is considered an outlier if it is more than 1.5 IQR away from the closest end of the box.
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5, 7, 9, 9, 10, 11, 13, 17, 29
Find if there are any outliers.
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Using the Calculator.
Put data in List Press 2nd stat Turn plot 1 on and choose boxplot Zoom 9
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22, 27, 33, 39, 57, 88, 110
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Comparative
Measure your longest finger. Create boxplot of girls vs boys. Describe
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Variation
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Standard Deviation
This is a measure of the average distance of the observations from their mean.
Variance – it is the average of the squared distance from the mean.
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Homework
Page 71 (89, 91, 93, 95, 97, 105, 107-110)
Bring Candy for tomorrow!