struck by lightning and surviving, algebra homework help

Use the information on

page 717

to explain what probability tells you about life’s risks. Include a description of the meaning of success and failure in the case of being struck by lightning and surviving.

12-3
Probability
Main Ideas
. Use combinations
and person to
find probability
• Create and we
graphs of probably
disbutions
GET READY for the Lesson
The risk of getting struck by
lightning in any given year is 1 in
250,000
The chances of surviving a
lightning striktare 3 in 4. These
risks and chances are a way of
describing the probability of an
event. The probability of an event is
a ratio that measures the chances of
the event occurring
New Vocabulary
prohly
rom we
probably dubulon
unfo darbus
rebate equity
Histo
Probability and Odds Mathematicians often use tossing of coins and
rolling of dice to illustrate probability when you tessa coin, there are
only two possible outcomes heads or tails. A desired outcome is called
a success. Any other outcome is called a failure
KEY CONCEPT
Probability of Success and Failure
ff an event can succeed in s ways and fail inf ways, then the probabilities of
success, P(S), and of failure. Pl), are as follows.
Reading Math
Notation Whois
filed by an eventi
preise stands
Here are two wers
nahel stands
Isrpen
The probability of an event occurring is always between 0 and 1,
inclusive. The closer the probability of an event is to 1, the more likely
the event is to occur. The clock the probability of an event is to 0, the less
likely the event is to occur. When all outcomes have an equally likely
chance of occurring, we say that the outcomes occur at random
EXAMPLE Probability with Combinations
Monifa has a collection of 32 CDs-18 R&B and 14 rap. As she is
leaving for a trip, she randomly chooses 6 CDs to take with her.
What is the probability that she selects 3 R&B and 3 rap?
Step 1 Determine how many 6-CD selections meet the conditions
(18,31 Select 3 R&R CDs. Their order does not matter
0114,3) Select 3 rap CDs.
Step 2 Use the Fundamental Counting Principle to finds, the
number of successes
141
C118, 3). C(143) = 1529 297,024
for at
18
Lesson 12-3 Probability 697