Download Prob review like test

Tues 9/4 & Wed 9/5
AGENDA
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Warm up text p.805; 18-23
Go over homework
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Go over Homework
P.548; 6-15
Base = 70
-7 pts for each problem not attempted.
10 pts for each correct.
6) Dependent
7) independent
8) ¼
9) ½
10) 1/40 11) 5/24
12) 8/51 13) 4/27 14) 0
15) 1/32
19) 0.0049
A bag contains 4 red marbles,
16 yellow marbles and 5
purple marbles. What is the
P(red, then purple) if a
marble is selected and
replaced, and then a 2nd
marble is selected?
4/25 • 5/25 = 4/125
License plates in a certain state
contain 2 letters followed by
3 digits. Assume that all
combinations are equally
likely. Find the number of
possible license plates.
26•26•10•10•10 = 676,000
There are 52 cards in a
deck. What is the
probability of drawing a
four, replacing it, and
then drawing a face
card?
4/52 • 16/52 = 4/169
At the ice cream shop,
there are 10 flavors and
3 cones to choose from.
How many possible
outcomes are there?
3 • 10 = 30
If A and B are independent
events such that P(A)= 0.25
and P(B)=0.18, what is the
P(A or B)?
0.25 + 0.18 = 0.43
You flip a coin and toss a 1-6
number cube.
Find P(heads and 4).
1/2 • 1/6 = 1/12
The reception is being catered. The
caterers offer 2 appetizers, 2
salads, and 3 main courses for
each eighth grade student to
choose for dinner. If the caterers
would like 36 different
combinations of dinners, how
many desserts should they offer?
2•2•3•x=36, 12x=36, x=3 desserts
A password consists of 3 letters.
The password is case sensitive,
which means upper-case and
lower-case letters are different
characters. What is the
probability of randomly being
assigned the password yEs?
1/52•1/52•1/52 = 1/140608
If A and B are independent
events such that P(A)= 0.25
and P(B)=0.33, what is the
P(A and B)?
0.25 • 0.33 = 0.0825
A password contains 4 digits.
Each digit is a number
between 0-9. What is the
probability that each digit
will be a 2?
1/10•1/10 •1/10 •1/10 = 1/10,000
Cobb County Schools needs 20
representatives for the Board of
Education Committee. Six members will
come from the high schools, six will
come from the middle schools, and eight
will come from the elementary schools.
The superintendent selects one of the
members to be a spokesman for the
whole committee. What is the probability
that he will choose a middle or high
school representative?
6/20 + 6/20 = 12/20 = 3/5
In the United States, 2/5 of all
households own 2 or more
televisions, and 1/3 of all
households own at least one
dvd player. What is the
probability that a household
picked at random will have 2 or
more televisions and at least
one dvd player?
2/5 • 1/3 = 2/15
Steve has two bags. Bag 1 contains 3
bandaids, 2 cotton balls, 4
toothpicks, and 2 combs. He also
has a second bag containing 2
rubberbands and 1 brush. What is
the probability that Steve selects a
bandaid from bag 1 and a
rubberband from bag 2?
3/11 • 2/3 = 2/11
There are 52 cards in a deck.
What is the probability of
drawing a king or an ace?
4/52 + 4/52 = 8/52 = 2/13
A company has a 5 symbol
code. The code consists of
two letters and 3 digits
that can be repeated. How
many different codes are
possible?
26 • 26 • 10 • 10 • 10 = 676,000
Fred rolls 2 number cubes.
What is the probability that
the two numbers will have a
sum of 8?
5/36
Answers for review packet