Asked by Joanna
A box contains 4 red and 5 blue marbles. Michele picks three marbles at random from this box. If Z is a random variable representing the # of blue marbles picked from the box, do the following.
a. Express the probability mass function of Z in tabular form.
b. Draw the corresponding histogram.
c. Compute the probability that Michele can pick more red marbles than blue from the box.
a. Express the probability mass function of Z in tabular form.
b. Draw the corresponding histogram.
c. Compute the probability that Michele can pick more red marbles than blue from the box.
Answers
Answered by
PsyDAG
Cannot do tables or histograms here.
c. This is the probability of picking either 2 or 3 red marbles.
P(2) = 4/9 * 3/8 * 5/7
P(3) = 4/9 * 3/8 * 2/7
Either-or probabilities are found by adding the individual probabilities.
c. This is the probability of picking either 2 or 3 red marbles.
P(2) = 4/9 * 3/8 * 5/7
P(3) = 4/9 * 3/8 * 2/7
Either-or probabilities are found by adding the individual probabilities.
Answered by
Nol
Can i ask why you multiplied it to 3/8 and 5/7 or 2/7?
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