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Mariulka [41]
3 years ago
12

A true/false test has 20 questions on it. What is the probability that you get at least 18 right by purely guessing?

History
1 answer:
skad [1K]3 years ago
8 0

Answer:

There is a 0.00038147% or 2^18 chance of getting 18 answers correctly by guessing.

Explanation:

Since there is a 1/2 chance for getting one question right, we would divide each quotient by 2 for 18 times. For example, it would go 1/2, 1/4, 1/8, 1/16, 1/32, etc. We would then multiply by 100 to get the percent.

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