Early Work – Oct. 16 A 10-pound bag of potatoes costs $1.19. At this rate, what would a 25-pound bag cost? Washington apples are selling for 50 cents a pound. If on the average, 2 apples equal one pound, what would be the cost of 20 apples? Set-up a proportion for each problem.

Hmwk Questions??? Grade it!!! Rest of proportions packet due Wednesday!!

Timed Test 1 now 1 later

Lesson 3.8 Experimental Probability

Probability The ratio of the number of successful outcomes to the number of possible outcomes. Always represented in lowest terms!!

Quam shot ten free-throws. He made 3 of his shots. What’s the probability that he makes a free-throw? Example 10 3  Total Outcomes OutcomesSuccessful P

Quam shot ten free-throws. He made 3 of his shots. What’s the probability that he misses a free-throw? Example 10 7  Total Outcomes OutcomesSuccessful P

Example Susie rolls a die five times and gets the following results: 2, 4, 1, 6, 2. What’s the probability she rolls a number greater than 3? 2 / 5 What’s the probability she rolls the number 1? 1 / 5 What’s the probability she rolls a 5? 0 / 5

Experimental Probability Let t be the number of trials in the experiment. Let f be the number of times a successful event occurs. The experimental probability, P, of the event is given by: t f P  t f P 

Example Coin Tosses Probability of landing on heads? Run three trials…

Example Birthdays J F M A M J J A S O N D Probability of a March b-day? One in the first six months?

Experimental Probability The probability written after an EXPERIMENT has been performed.

Example Design and conduct an experiment to determine the following experimental probability. Getting two heads when you flip a coin twice.

No RANDOM Numbers

Exercises & Problems P 183: 1 – 4, 7 – 19