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Standard VII

Mathematics

Calculating Probability of an Event

You have an e...

Question

You have an eight-faced die. In this die, one of the faces contains 1, two faces contain 2, three faces contain 3 and other faces contain a 4 and a 5 respectively. What is the probability of getting a 3 when the die is rolled? (All outcomes are equally likely).

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Solution

Probability of an event

= $\frac{Number of desired outcomes}{Total number of outcomes of the experiment}$

Total number of outcomes = 8

Number of desired outcomes i.e. getting a 3 = 3(3 faces contain the number 3)

Therefore, Probability of getting a three when the die is rolled is $\frac{3}{8}$ .

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You have an eight-faced die. In this die, one of the faces contains 1, two faces contain 2, three faces contain 3 and other faces contain a 4 and a 5 respectively. What is the probability of getting a 3 when the die is rolled? (All outcomes are equally likely).

Probability of an event = Number of desired outcomesTotal number of outcomes of the experiment Total number of outcomes = 8 Number of desired outcomes i.e. getting a 3 = 3(3 faces contain the number 3) Therefore, Probability of getting a three when the die is rolled is 38.