A random sample of the 500 registered voters in Phoenix is asked if they favor the employ of oxygenated fuels year round to decrease air pollution. If more than 400 votes respond positively we will conclude that more than 60% of voters favore the employ of these fuel cells. Find out the probability of type I error if exactly 60% of the voters favor the employ of these fuels. What is the type II error probabiliy B(beta) if 75% of the voters favor this action. (Use normal approximation to the binomial)