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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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Page 1: 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

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.

Page 2: 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

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?

Page 3: 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

Finishing Mean/Median

Page 4: 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

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

Page 5: 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

mod

mean

median

e

mode median mean

modmean median e

Page 6: 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

Boxplots

Page 7: 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

Boxplots

Provides information about the center, spread, and symmetry (skewness) of the data.

Multiple boxplots can be used to compare data.

Page 8: 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

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.

Page 9: 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

5, 8, 13, 17, 22, 24, 25, 27, 29, 30

Page 10: 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

8, 10, 22, 24, 25, 25, 26, 27, 45, 72

Graph & Describe

Page 11: 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

Outlier

A value is considered an outlier if it is more than 1.5 IQR away from the closest end of the box.

Page 12: 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

5, 7, 9, 9, 10, 11, 13, 17, 29

Find if there are any outliers.

Page 13: 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

Using the Calculator.

Put data in List Press 2nd stat Turn plot 1 on and choose boxplot Zoom 9

Page 14: 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

22, 27, 33, 39, 57, 88, 110

Page 15: 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

Comparative

Measure your longest finger. Create boxplot of girls vs boys. Describe

Page 16: 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

Variation

Page 17: 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

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.

Page 18: 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

Homework

Page 71 (89, 91, 93, 95, 97, 105, 107-110)

Bring Candy for tomorrow!


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