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AGENDA: Get textbook Daily Grade #1--- 10 minutes Use your clicker to submit answers. NO COMMAS NEEDED. DG#1A  Test 1 DG#1B  Test 2 Notes Lesson 2: Probability

Unit 1: Probability and Statistics Accel Precalculus Unit 1: Probability and Statistics Lesson 2: Probability EQ: How do you find probability of mutually exclusive events, independent events, and complements of event?

p. 674 How do some businesses, such as life insurance companies, and gambling establishments, make dependable profits on events that seem unpredictable? Businesses have discovered that the overall likelihood, or probability, of an event can be discovered by observing the results of a large number of repetitions of the situation in which the event may occur.

Trial: a systematic opportunity for an event to occur rolling a die New Terminology: DEFINITION EXAMPLE Trial: a systematic opportunity for an event to occur rolling a die Experiment: one or more trials rolling a die 10 times Sample Space: the set of all possible outcomes of an event 1, 2, 3, 4, 5, 6 Event: an individual outcome or any specified combination of outcomes rolling a 3 rolling a 3 or rolling a 5 Outcomes are random if all possible outcomes are equally likely.

Now Try p. 682 #1

In Exercises 1 – 6, determine the sample space for the given experiment. 1. A coin and a six-sided die are tossed S = {H1, T1, H2, T2, H3, T3, H4, T4, H5, T5, H6, T6}

Expressing Probability: 1. must be a number from 0 to 1, inclusive 2. may be written as a fraction, decimal, or percent 3. an impossible event has a probability of 0 4. a certain event has a probability of 1 the sum of the probabilities of all outcomes in a sample space is 1

Now Try p. 682 #7

7 – 10, 7. E = { HTT, THT, TTH}

15. The sum is 5. E = { (1, 4),(2, 3), (3, 2), (4, 1)} TOSSING A DIE In Exercises 15–18, find the probability for the experiment of tossing a six-sided die twice. 15. The sum is 5. E = { (1, 4),(2, 3), (3, 2), (4, 1)} **RECALL the FCP:

Now Try p. 682 #21

NOTE: No Replacement! DRAWING MARBLES In Exercises 21–24, find the probability for the experiment of drawing two marbles(without replacement) from a bag containing one green, two yellow, and three red marbles. 21. Both marbles are red. NOTE: No Replacement! Draw 2 red out of 6 total Draw 2 red out of 3 red

WHY?

***Combination because ORDER doesn’t matter Now Try p. 684 #49 ***Combination because ORDER doesn’t matter

Now Try p. 682 #52

52.

P(available) = 0.9 P(not available) = 0.1 Now Try p. 682 #54 P(available) = 0.9 P(not available) = 0.1

ASSIGNMENT: p. 682 – 685 #6, 10, 18, 23, 24, 41, 50, 51, 55