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 A∩BA \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(A∩B)=0.12P(A \cap B) = 0.12 and P(B)=0.3P(B) = 0.3.
Compute the conditional probability P(A∣B)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(A∩B)=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(A∣B)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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