The random variable X is the number of houses sold by a realtor in a single month at the Sendsom's Real Estate office. Its probability distribution is given in the following table. 7 Houses Sold 0 6 1 2 3 4 5 0.21 Probability 0.24 0.11 0.01 0.12 0.16 0.01 0.14 a) What is the probability the number of houses sold by a realtor in a single month at the Sendsom's Real Estate office is more than 4? [A] b) What is the probability the number of houses sold by a realtor in a single month at the Sendsom's Real Estate office is less than 3? [B] c) What is the mean? [C] d) What is the standard deviation? [D] (Round answer to 3 decimal places.)