4.Price of Gas. The Pew Research Center reports that, in March 2011, 90% of Americans said they were hearing mostly bad news about the price of gasoline. A random sample of 15 Americans is taken.
Find the probability that 12 Americans said that they were hearing mostly bad news about the price of gas.
Find the probability that between 12 and 14 Americans inclusive said that they were hearing mostly bad news about the price of gas.
Find the mean, variance, and standard deviation of the number of Americans. Interpret the mean.