4.E: Probability Using Tree Diagrams and Combinations (Optional Exercises)
SECTION 8.3 PROBLEM SET: PROBABILITIES USING TREE DIAGRAMS AND COMBINATIONS
Two apples are chosen from a basket containing five red and three yellow apples.
Draw a tree diagram below, and find the following probabilities.
| 1) P( both red) | 2) P(one red, one yellow) |
| 3) P(both yellow) | 4) P(First red and second yellow) |
A basket contains six red and four blue marbles. Three marbles are drawn at random.
Find the following probabilities using the method shown in Example 8.3.2. Do not use combinations.
| 5) P( All three red) | 6) P(two red, one blue) |
| 7) P(one red, two blue) | 8) P(first red, second blue, third red) |
Three marbles are drawn from a jar containing five red, four white, and three blue marbles.
Find the following probabilities using combinations.
| 9) P(all three red) | 10) P(two white and 1 blue) |
| 11) P(none white) | 12) P(at least one red) |
A committee of four is selected from a total of 4 freshmen, 5 sophomores, and 6 juniors. Find the probabilities for the following events.
| 13) At least three freshmen. | 14) No sophomores. |
| 15) All four of the same class. | 16) Not all four from the same class. |
| 17) Exactly three of the same class. | 18) More juniors than freshmen and sophomores combined. |
Five cards are drawn from a deck. Find the probabilities for the following events.
| 19) Two hearts, two spades, and one club. | 20) A flush of any suit ( all cards of a single suit ). |
| 21) A full house of nines and tens ( 3 nines and 2 tens ). | 22) Any full house. |
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23) A pair of nines and a pair of tens
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24) Any two pairs ( two cards of one value, two more cards of another value, and the fifth card does not have the same value as either pair ). |
Jorge has 6 rock songs, 7 rap songs and 4 country songs that he likes to listen to while he exercises.
He randomly selects six (6) of these songs to create a playlist to listen to today while he exercises.
Find the following probabilities:
| 25) P(playlist has 2 songs of each type) | 26) P(playlist has no country songs) |
| 27) P(playlist has 3 rock, 2 rap, and 1 country song) | 28) P(playlist has 3 or 4 rock songs and the rest are rap songs) |
A project is staffed 12 people: 5 engineers, 4 salespeople, and 3 customer service representatives.
A committee of 5 people is selected to make a presentation to senior management.
Find the probabilities of the following events.
| 29) The committee has 2 engineers, 2 salespeople, and 1 customer service representative. | 30) The committee contains 3 engineer and 2 salespeople. |
| 31) The committee has no engineers. | 32) The committee has all salespeople. |
Do the following birthday problems.
| 33) If there are 5 people in a room, what is the probability that no two have the same birthday? | 34) If there are 5 people in a room, find the probability that at least 2 have the same birthday. |