Question

One number is selected from the set {1, 2, 3, 4, 5, 6, 7, 8, 9}. Find the probability the selected number is less than 7, given that it is less than 8.

Give your answer as a decimal rounded to 4 decimal places.

Answer 1

I just got this question in my book, and i already solved it. so just saying that i now the answer, it is 0.8571

Answer 2

Answer: 0.8571

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Step-by-step explanation:

We're told that "given that it is less than 8", so we only focus on these values {1,2,3,4,5,6,7}. There are B = 7 items in this set.

Of those, the set {1,2,3,4,5,6} are less than 7. There are A = 6 items in this set.

The probability we're after is A/B = 6/7 = 0.8571