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probability of rolling a number less than 5










































what is the probability of rolling a number less than 5?

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Jan 10, 2012
Probability
by: Staff


Question:

What is the probability of rolling a number less than 5?


Answer:


The theoretical probability of getting any single face when a fair die is rolled is 1/6

All of the possibilities for numbers less than 5 are:

The theoretical probability of getting a 1 when a fair die is rolled is 1/6

The theoretical probability of getting a 2 when a fair die is rolled is 1/6

The theoretical probability of getting a 3 when a fair die is rolled is 1/6

The theoretical probability of getting a 4 when a fair die is rolled is 1/6


The combined theoretical probability of getting a 1, 2, 3, or 4 (but not a 5 or a 6) is:

(1/6) + (1/6) + (1/6) + (1/6) = 4/6 = 2/3


The final answer to your question is: 2/3


Thanks for writing.
Staff

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