SOLUTION: Please help me with this question:) A pet store has 4 puppies, 6 kittens, 3 hamsters and 5 snakes. Four of the animals are going to be selected to appear in an upcoming newspaper

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Question 1117870: Please help me with this question:)
A pet store has 4 puppies, 6 kittens, 3 hamsters and 5 snakes. Four of the animals are going to be selected to appear in an upcoming newspaper ad. The owner decides to randomly select the animals that will be used in the ad.
a)
State the number of successes, the number of dependent trials, the population size，and the number of successes in the population.
b)
Create the probability distribution for the number of snakes that will appear in the ad.
c)
Calculate the expected value for the number of snakes in the ad.
Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


With what you have shown in the statement of the problem, question a makes no sense; we don't know what a "success" is.

question b...

The probability of having n snakes among the 4 animals is given by the function

%28%28C%285%2Cn%29%2AC%2813%2C4-n%29%29%29%2FC%2818%2C4%29

Those function values are

4 snakes: 1/612
3 snakes: 26/612
2 snakes: 156/612
1 snake: 286/612
0 snakes: 143/612

question c...