The accompanying table describes the random variable x, the numbers of adults in groups of five who reported sleepwalking. Complete parts (a) through (d) below.

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Part 1

a. Find the probability of getting exactly 4 sleepwalkers among 5 adults.

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(Type an integer or a decimal. Do not round.)

Part 2

b. Find the probability of getting 4 or more sleepwalkers among 5 adults.

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(Type an integer or a decimal. Do not round.)

Part 3

c. Which probability is relevant for determining whether 4 is a significantly high number of sleepwalkers among 5 adults: the result from part (a) or part (b)?

A.

Since the probability of getting fewer than 4 sleepwalkers is the complement of the result from part (b), this is the relevant probability.

B.

Since the probability of getting 5 sleepwalkers is less likely than getting 4 sleepwalkers, the result from part (a) is the relevant probability.

C.

Since the probability of getting 4 sleepwalkers is the result from part (a), this is the relevant probability.

D.

Since the probability of getting 4 or more sleepwalkers is the probability of the given or more extreme result, the result from part (b) is the relevant probability.

Part 4

d. Is 4 a significantly high number of 4 sleepwalkers among 5 adults? Why or why not? Use 0.05 as the threshold for a significant event.

A.

Yes, since the appropriate probability is greater than 0.05, it is a significantly high number.

B.

No, since the appropriate probability is less than 0.05, it is not a significantly high number.

C.

No, since the appropriate probability is greater than 0.05, it is not a significantly high number.

D.

Yes, since the appropriate probability is less than 0.05, it is a significantly high number.

0	0.185
1	0.403
2	0.244
3	0.128
4	0.034
5	0.006