Question

2. Assume that random guesses are made for 3 multiple choice questions on a test, so...

2. Assume that random guesses are made for 3 multiple choice questions on a test, so that there are n=3 trials, each with a probability of success given by p=0.2. Find the indicated probability for the number of correct answers.

ROUND YOUR ANSWERS TO 3 DECIMAL PLACES

a. Find the probability that the number x correct answers will be exactly 3.__________Q7

b. Find the probability that the number x correct answers will be at least 2.__________ Q8

c. Find the probability that the number x correct answers will be fewer than 2.___________ Q9

Math   Statistics-And-Probability   
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Answer #1

a) probbility of getting 3 correct answer is

the probability that the number x correct answers will be exactly 3 =0.08

b) the probability that the number x correct answers will be at least 2 =

c)  the probability that the number x correct answers will be fewer than 2

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