help please

A salesperson figures that the probability of a successful sale during the first contact with a client is 0.2 but improves to 0.65 on the second contact if the client did not buy during the first contact. Suppose this salesperson makes one and only one callback to any client who did not buy during the first contact. If Jacob is one of her clients, calculate the probabilities for the following events. (Enter your answers to two decimal places.) (a) Jacob buys from her. (b) Jacob does not buy from her. A county containing a large number of rural homes is thought to have 60% of those homes insured against fire. Four rural homeowners are chosen at random from the entire population, and x are found to be insured against fire. Generate the probability distribution table for x. x 0 1 2 3 4 Sum P(x) (a) What is the probability that at least three of the four homes are insured against fire? (b) What is the mean or the expected value of the random variable x? (c) What is the standard deviation of the random variable x