M119L09to10-page13

M119L09to10-page13 - ( ) = 23 26 0.885 or 88.5% Warning:...

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(Lesson 10: Addition Rule; 4-3) 4.13 Solution to Example 4 We will boldface the entries that correspond to Juniors or students receiving “B”s or “C”s. Their sum is 23. Think About It: What’s an easy way of determining that the sum is 23, aside from adding the boldfaced entries directly? A B C Sophomores 1 0 2 Juniors 5 8 1 Seniors 2 4 3 P a random student in the class is a Junior or is getting a "B" or a "C"
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Unformatted text preview: ( ) = 23 26 0.885 or 88.5% Warning: Although we sometimes want to write down row and column totals, they may have been misleading in the previous Example. In the following table, you should be warned against adding 14, 12, and 6. A B C Total Sophomores 1 2 3 Juniors 5 8 1 14 Seniors 2 4 3 9 Total 8 12 6 N =26...
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