4 . In a second grade class containing 15 girls and 9 boys 2 students are selected at random to give out the math papers . What is the probability that the second student chosen is a boy given that the first one was a girl ? AL $ 15 81 5 9 0 ) D ) B 23 8 23 27 Answer : B 5 . In a large bag of marbles , 409 of them are red , A child chooses 4 marbles from this bag . If the child chooses the marbles at random , what is the chance that the child gets exactly three red marbles A ) 0 . 154 8 ) 0 . 230 0 1 0 . 346 0 1 0 . 256 Answer : A 6 . Find the probability 10 36 5 2 5 1 43 using the standard normal distribution A l 0. 2831 8 07169 0 07831 D ) 0.5600 Answer : A9 . A pet supplier has a stock of parakeets of which 309 6 are blue parakeets . A pet store orders 5 parakeets from this supplier . If the supplier selects the parakeets at random , what is the probability that the pet store gets al exactly one blue parakeet ? Ans : 0. 36015 = 36 029 b ) at most 2 blue parakeets ? Ans : 0.837 10 Find using the Standard Normal Curve the value PLUS 2 5 0.97 ) Ans : 0.33401 1 . The average hourly wage of workers at a fast food restaurant is 56 . 50 / hr . Assume the wages are normally distributed with a standard deviation of 50 45 If a worker at this fast food estaurant is selected at random a ) What is the probability that the worker earns more than 56 75 ? Ans . 28.906 b ) What is the probability that the worker ears between $6 .50 and $6 75 ? Ans , 21 19 612 . Mrs . Smith's reading class can read an average of 175 words per minute with a standard deviation of 20 words per minute . The top 39 of the class is to receive a special award . What is the minimum number of words per minute a student would need to read in order to get the award ? Assume the data is normally distributed . Ans : 213