Back to Tutor Intake Assessment: Conditional Probability and the Rules of Probability

HSS.CP Tutor Intake - Events, Independence, Conditional Probability, and the Rules of Probability

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Grade 11·10 problems·~14 min·Common Core Math - HS Statistics and Probability·domain·cp
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A

Concepts

1.

For a single roll of a fair die, let A={2,4,6}A = \{2, 4, 6\} (even) and
B={4,5,6}B = \{4, 5, 6\} (greater than 3). Which outcomes make up the event
"AA and BB" (the intersection ABA \cap B)?

2.

Two events AA and BB each have positive probability. Which statement
correctly distinguishes independent events from mutually exclusive
events?

3.

A club will choose 3 of its 10 members. In which situation does the
order of selection matter, so that you would count arrangements
(a permutation) rather than unordered selections (a combination)?

B

Procedures

1.

Events AA and BB satisfy P(AB)=0.12P(A \cap B) = 0.12 and P(B)=0.3P(B) = 0.3.
Compute the conditional probability P(AB)P(A \mid B). Give a decimal.

2.

For events AA and BB, P(A)=0.5P(A) = 0.5, P(B)=0.4P(B) = 0.4, and
P(AB)=0.2P(A \cap B) = 0.2. Are AA and BB independent, and why?

3.

A fair die is rolled once. Let AA be "the result is even" and BB be
"the result is greater than 3." Working from the outcomes directly,
compute P(AB)P(A \mid B) as a fraction.

4.

One card is drawn from a standard 52-card deck. Using the Addition
Rule, compute P(king or heart)P(\text{king or heart}) as a fraction.
(There are 4 kings, 13 hearts, and 1 king of hearts.)

5.

Two cards are drawn from a standard 52-card deck WITHOUT replacement.
Compute the probability that both are kings, as a fraction. (Leave the
numerator and denominator unmultiplied if you wish, e.g. write it as a
product of two fractions.)

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