Question

A spinner is shown below. Brent is going to spin the arrow on the spinner twice and add the resulting numbers. The table shows the sample space of all the possible sums.



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According to the table, what is the probability that the sum is less than 5?


1
4


3
8


1
2


7
12

Answer 1

If the spinner has numbers 1–4, there are 4×4 = 16 equally likely ordered outcomes. Sums less than 5 are 2, 3, or 4, which occur in 1 + 2 + 3 = 6 outcomes. So the probability is 6/16 = 3/8.