Assume there are 13 homes in the Quail Creek area and 4 of them have a security system. Three homes are selected at random: What is the probability all three of the selected homes have a security system? (Round your answer to 4 decimal places.)

Step-by-step explanation:

a. (4/21)(3/20)(2/19)=0.0030

b. (17/21)(16/20)(15/19)=0.5113

c. At least one is 1-probability of none or 1-0.5113=0.4887

They are dependent in that once I pick a home, it changes the probability for the second choice to a conditional probability.

Step-by-step explanation:

a. (4/21)(3/20)(2/19)=0.0030

b. (17/21)(16/20)(15/19)=0.5113

c. At least one is 1-probability of none or 1-0.5113=0.4887

They are dependent in that once I pick a home, it changes the probability for the second choice to a conditional probability.

the square root of what number? if you add that, then someone will probably answer the question.