Question 1

42% of US adults have a gun in their household. If 10 US adults are selected at random, find the expected number who have a gun in their household.

Accepted Answer

4.2

Question 2

42% of US adults have a gun in their household. If 10 US adults are selected at random, find the probability that none of them have a gun in their household.

Accepted Answer

0.4%

Answer

1.7%

Answer

4%

Answer

0.017%

Question 3

42% of US adults have a gun in their household. If 10 US adults are selected at random, find the probability that exactly 5 of them have a gun in their household.

Accepted Answer

21.6%

Answer

1.7%

Answer

1.3%

Answer

8.6%

Question 4

Let X be a discrete, random variable. Which expression is equivalent to $P(X>7)$?

Accepted Answer

$1-P(X\le7)$

Answer

$1-P(X<6)$

Answer

$P(X\le7)$

Answer

$1-P(X\le6)$

Question 5

42% of US adults have a gun in their household. If 10 US adults are selected at random, find the probability that at most 2 of them have a gun in their household.

Accepted Answer

13.7%

Answer

10.2%

Answer

17.6%

Answer

21%

Question 6

42% of US adults have a gun in their household. If 10 US adults are selected at random, find the probability that at least 7 of them have a gun in their household.

Accepted Answer

7.1%

Answer

1.7%

Answer

92.9%

Answer

98.3%

Question 7

42% of US adults have a gun in their household. If 10 US adults are selected at random, find the probability that all of them have a gun in their household given that at least 7 of them have a gun in their household.

Accepted Answer

0.2%

Answer

99.8%

Answer

0.0017%

Answer

0%

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