Stat 160 Postquiz #3 over Sections 2.1 - 2.6



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1. Roll two fair dice. What is the probability that the sum of the upfaces is 5?


0.028
0.056
0.111
0.167

2. From an ordinary deck of 52 cards (26 red and 26 black), 3 cards are drawn without replacement. Using a tree diagram find the probability that all the cards drawn are black.


0.5
0.118
0.058
0.111

3. Referring to the situation in #2, what is the probability of not getting 3 red cards?


0.882
0.5
0.942
0.889

4. Suppose the probability that a baby born is a boy is 0.3. Assuming births are independent of each other, what is the probability that the first 4 children born to a couple are all boys?


0.10
0.0081
0.0256
1.6

5. In a room there are 30 people, 10 of whom are females. Three people are chosen at random and each are given $1000. Suppose each of the chosen is a male. Is this odd? Determine the probability (use a tree diagram) of this occurring.
 

 

0.704
0.296
0.281
0.667