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Independent Events: One event does NOT effect the probability
of the other.
Dependent Events: One event does effect the probability
of the other.
State whether each set of events is independent or
dependent. Explain each answer.
1.) Erica flips a coin and then she rolls a die.
2.) John chooses a classmate for his group and then chooses
another classmate for his group.
3.) Jane rolls a six sided die and then rolls another six sided
die.
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1.) A reading list contains 5 historical books and 3 science-fiction
books. What is the probability that Alex will randomly choose a
historical book for his first report and a science-fiction book for
his second without replacement?
historical
historical
historical
historical
historical
science-fiction
science-fiction
science-fiction
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3.) Jill has seven quarters in her pocket. Of these, three are
“Delaware” quarters, two are “Georgia” quarters, one is a
“Connecticut” quarter, and one is a “Pennsylvania” quarter. Jill
removes one quarter at random and then removes a second quarter
at random without replacing the first quarter. What is the
probability that both will be “Delaware” quarters?
Connecticut
Georgia
Pennsylvania
Delaware
Delaware
Georgia
Delaware
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4.) On a multiple choice test, each question had four possible
answers. A student does not know the answers to two questions,
so he guesses. What is the probability that the student will get
both answers wrong?
1.) The sky is:
a.) Blue b.) Black c.) Red d.) Orange
2.) 2 + 2 =
a.) 2 b.) 3 c.) 4 d.) 5
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5.) In a bag there are 5 blue, 2 red, and 3 green marbles. What is the
probability of choosing a blue marble at random and then choosing a
green marble if you replace the first marble?
