M119L09to10-page1

# M119L09to10-page1 - ≤ P A ≤ 1 Scale for P A 1 − P A =...

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(Lesson 9: Probability Basics; 4-2) 4.01 CHAPTER 4: PROBABILITY The French mathematician Laplace once claimed that probability theory is nothing but “common sense reduced to calculation.” This is true many times, but not always …. LESSON 9: PROBABILITY BASICS (SECTION 4-2) PART A: PROBABILITIES Let P A ( ) = the probability of event A occurring. P A ( ) must be a real number between 0 and 1, inclusive:
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Unformatted text preview: ≤ P A ( ) ≤ 1 Scale for P A ( ) : 1 − P A ( ) = the probability of event A not occurring, P not A ( ) . Note: The event “not A ” is also called the complement of A , denoted by A or A C . Example 1: If the probability that it will rain here tomorrow is 0.3, then the probability that it will not rain here tomorrow is 1 − 0.3 = 0.7 ....
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