Name
J\ Ujf-------------
Date
~
Practice B
~
Independent and Dependent Events
Tell whether each set of events is independent
Explain your answer.
1. You roll a die and flip a coin.
()O-\- off<ct i11t
Class
or dependent.
In d.( pendm+)
res \t nf+ cc
ihe. r e..s\A I r of tht die rioe:..s
lY\
2. You select one marble, do not replace it, then select another marble.
3. A number c be is rolled three times. What is the probability
of rolling a 2 each time?
4. The numbers 1 - 40 are written on pieces of paper and put ::lin a box. Two pieces of paper are randomly selected. What
is the probability both numbers will be multiples of 4? A-O
1"',~11.2, /'''"', Z.O,'2"tI1..<i</ ;~/3(P /T
-fD-1
5. A coin is tossed 4 times. What is the probability of getting
4 tails? .L . .l-. _ 1- _.L:'. .L,
'2
2- 2
L
I~
6. A bag contains 2 yellow, 12 red, and 6 green marbles .
.J..
5)
=J-g:; 1"
-to'tcJ,..)
2-'0
.:rrtd~~ta.
,
'btput:la.t1t
'D<.
i
_
de..ocndent
\
,
fL S:Qyy) k spact,
.L. J.. ....L
f.o' ~
lo -
21 to
~
~ --34" • fq
J 519
.i.
tfiJ
ILv
What is the probability of selecting a red marble,
replacing it, then selecting another red marble?
b. What is the probability of selecting a red marble,
not reRlacing)t, then selecting another red marble?
de ~ c. What is the probability of selecting 1 yellow marble,
not replacing it, then selecting a green marble?
p-et1 n
1)epen~
7. There are 7 girls and 3 boys in a class. Two students
t are to be randomly chosen for a special project.
a. What is the probability both students will be girls?
~(~) 1 ~ '3 b -:. To
P (CjQfkr3)"<-- ~:: ~
b. What is the probability both students will be boys?
pCb) '33b ~ roo P ( bo.fu b) ~~ ~I
c.
What is the pr6babilit of selec~'ng a boy and a girl?
p (b),h3q -= ?/IO
P(SQ
b)-= 7 Gt
A music c1ass consists of 9th and 1 th graders as
shown in the table. Two students will be selected
at the same tim.!. D-e.p enden;-male
8. What is the probability both students are male?
P(~)
~o
PL)ylOl~C,-t\)
/I.P/?Cj
\)9(.
t'.
is the probability both stur;t~nts are 9th graders?
enWhat/ L"'t
D P(~ f-t1:..r G\ J:: L.'lit
'2.
0.
~CJ
10. What IS the probability one student
second student is male?
/?
P (f)
10 P(M a.ftu- f-) 3<1
IS
female and the
2.~/
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52
Holt Algebra 1
52