Early Work – Oct. 16
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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
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?
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