Math 227 - Statistics » Spring 2023 » 09P Binomial Probability Distributions & Poisson Probability Distributions

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Question #1
An archer is able to hit the bull's-eye 74% of the time. If she shoots 11 arrows, what is the probability that she gets exactly 0 bull's-eyes? Assume each shot is independent of the others. Express your answer as a percentage rounded to the nearest hundredth without the % sign.
A.   2
B.   1
C.   0
D.   3
Question #2
According to a college survey, 82% of all students work full time. Find the mean for the number of students who work full time in samples of size 115 (rounded to the nearest hundredth).
A.   94.3
B.   92.1
C.   86.5
D.   96.8
Question #3
According to a college survey, 81% of all students work full time. Find the standard deviation for the number of students who work full time in samples of size 77 (rounded to the nearest hundredth).
A.   3.11
B.   2.75
C.   3.44
D.   5.33
Question #4
A survey for brand recognition is done and it is determined that 39% of consumers have heard of Dull Computer Company. A survey of 16 randomly selected consumers is to be conducted. For such groups, would it be significantly low to get 3 consumers who recognize the Dull Computer Company name? Why or why not? Explain your answer using descriptive statistics and/or probability appropriately. If your reasoning requires a z-score, enter the z-score rounded to the nearest hundredth. If your reasoning requires a probability, enter the probability as a decimal rounded to the nearest ten-thousandth.
A.   0.0676
B.   0.0659
C.   0.0739
D.   0.0759
Question #5
A naturalist leads whale watch trips every morning in March. The number of whales seen has a Poisson distribution with a mean of 1.82. Find the probability that on a randomly selected trip, the number of whales seen is 5. Express your answer as a percentage rounded to the nearest hundredth.
A.   2.3
B.   2.7
C.   1.9
D.   3.7
Question #6
Suppose the probability of contracting a certain disease is 1 in 62 for a new case in a given year. Approximate the probability that in a town of 262 people there will be at least one new case of the disease next year. Express your answer as a percentage rounded to the nearest hundredth without the % sign.
A.   93.25
B.   88.93
C.   98.54
D.   96.41

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