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Lyn wrote a 15-item true/false examination and got 10 correct. What is the probability that this...

Lyn wrote a 15-item true/false examination and got 10 correct. What is the probability that this was by total chance?

Select one:

a. 0.07

b. 0.1

c. 0.09

d. 0.08

math   Statistics-And-Probability   
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Answer #1

n=15

p=0.5

P ( X =    10   ) = C(15,10) * 0.5^10 * (1-0.5)^5 =           0.09 (answer)

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