BUS 308 Week 2 Problems

1.Suppose that a couple will have three children. Letting B denote a boy and G denote a girl:

a. Draw a tree diagram depicting the sample space outcomes for this experiment

b. List the sample space outcomes that correspond to each of the following events:

1) All 3 children will have the same gender

2) Exactly 2 of the 3 children will be a girl

3) Exactly 1 of the 3 children will be a gir

4) None of the 3 children will be a girl.

c. Assuming that all sample space outcomes are likely, find the probability of each of the events given in part b.

2.John and Jane are married. The probability that John watches a certain television show is .4. The probability that Jane watches the show is .5. The probability that John watches the show, given that Jane does, is .7.

a. Find the probability that both John and Jane watch the show.

b. Find the probability that Jane watches the show, given that John does.

c. Do John and Jane watch the show independently of each other? Justify your answer.

3.Suppose that the probability distribution of a random variable x can be described by the formula p(x) = x/15

for each values x = 1,2,3,4 and 5. For example, then, P(x=2)=p(2)=2/15.

a. Write out the probability distribution of x.

b. Show that the probability distribution of x satisfies the properties of a discrete probability distribution.

c. Calculate the mean of x.

d. Calculate the variance, o (o to 2nd power), then x on bottom right, and the standard deviation, o (x to bottom right).

6.22(a)
4.In each case, sketch the two specified normal curves on the same set of axes:

a. A normal curve with u=20 and o=3, and a normal curve with u=20 and 0=6.

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BUS 308 Week 2 Problems

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