Transcript Early Work – Oct. 16

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!!
Example

Quam shot ten free-throws. He made 3 of his
shots. What’s the probability that he makes a
free-throw?
Successful Outcomes 3
=
P=
Total Outcomes
10
Example

Quam shot ten free-throws. He made 3 of his
shots. What’s the probability that he misses a
free-throw?
Successful Outcomes 7
=
P=
Total Outcomes
10
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
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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:
f
P=
t
Example
Coin Tosses
 Probability of landing on heads?
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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?
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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