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Conditional Probability & Bayes' Theorem · Question 55 of 125

Question 55

EasyOriginal question

A coin is tossed and a die is thrown. What is the probability of a head on the coin and a number greater than 4 on the die?

Options for question 55

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. The coin and the die do not affect each other: a head has probability 12\frac{1}{2}, and a number greater than 4 is 5 or 6, with probability 26=13\frac{2}{6} = \frac{1}{3}.

  2. 12×13=16\frac{1}{2} \times \frac{1}{3} = \frac{1}{6}.

Worth noting

56=12+13\frac{5}{6} = \frac{1}{2} + \frac{1}{3} adds; for both of two independent events to happen, multiply.

Concept
Two or three independent trials
Typical time
60 s
Your time
—
The rule this testsIndependent events
Practise this chapter →

Ten questions from Conditional Probability & Bayes' Theorem, at your own pace.

Practise this chapter →

Ten questions from Conditional Probability & Bayes' Theorem, at your own pace.