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Counting and Basic Probability · Question 55 of 65

Question 55

EasyOriginal question

Rukhsana tosses a fair coin and rolls a fair die at the same time. What is the probability that she gets a head on the coin and an even number on the die?

Options for question 55

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. The coin and the die are independent: P(head) =12= \frac{1}{2}, P(even) =36=12= \frac{3}{6} = \frac{1}{2}.

  2. P(head and even) =12×12=14= \frac{1}{2} \times \frac{1}{2} = \frac{1}{4}.

Worth noting

34\frac{3}{4} is P(head OR even). 112\frac{1}{12} is the chance of one particular pair, such as a head with a 4.

Concept
Independent events on different objects
Typical time
40 s
Your time
—
The rule this testsCoins, dice and cards
Practise this chapter →

Ten questions from Counting and Basic Probability, at your own pace.

Practise this chapter →

Ten questions from Counting and Basic Probability, at your own pace.