Question

3- Two balls are drawn from a bag containing 3 white balls and 4 red balls. If the first ball is replaced before the second is drawn, what is the probability that a. Both balls are red? b. Both balls are white? c. The first ball is red and the second ball is white? d. One of the balls is black?

4- A bag contains 7 coins, of which 4 are fair; the remaining coin has a head on both sides. If a coin is selected at random from the bag and tossed three times, what is the probability that a. Heads will occur exactly twice? b. Heads will occur at least twice?

5- A hospital buys blood pressure monitors in lots of 1000. On average, 2 out 1000 is defective. If 10 are selected from one lot a. What is the probability that none is defective? b. What is the probability that the first two are defective? c. What is the probability that exactly three are defective? d. What is the probability 6- Find the mean, mode, median, and standard deviation for the following data set: {14, 17, 13, 16, 15, 12, 13, 12, 14}

Answer 1