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The probability distribution for the number of adults in groups who reported sleepwalking is provided.

a.

Letx be the number of sleepwalkers in a group of five.

Using the probability distribution table, the probability corresponding to 1 sleepwalker among 5 adults is 0.363.

Thus, the probability of getting exactly 1 sleepwalker among 5 adults is 0.363.

b.

Using the probability distribution table, the probability corresponding to 1 sleepwalker is 0.363.

The probability corresponding 0 sleepwalkers is 0.172.

The probability of getting 1 or fewer sleepwalkers among 5 adults is computed as:

$$\begin{gathered} P\left(x猢�1\right)=P\left(x=0\right)+P\left(x=1\right) \\ =0.172+0.363 \\ =0.535 \end{gathered}$$

Thus, the probability of getting 1 or fewer sleepwalkers among 5 adults is 0.535.

c.

The following probability expression is used to determine if the given sample value is significantly low or not:

$P\left(x\text{or}\text{fewer}\right)猢�0.05$

If the above expression holds true, then the number of successes for that event can be considered significantly low.

Here, part (b) computes the probability of 1 or fewer sleepwalkers in a sample of 5 adults.

Therefore, the probability computed in part (b) is relevant for concluding whether 1 sleepwalker is significantly low or not.

d.

Since the probability of 1 or fewer number of sleepwalkers in a sample of 5 adults is 0.535, which is not less than or equal to 0.05, thus, the number of sleepwalkers equal to 1 cannot be considered significantly low.