The proportion of households in a region that do some or all of their banking on the Internet is 0.25. In a random sample of 1000 households from this region, let x be the number that do some or all of their banking on the Internet. a. Find the mean of x. b. Find the standard deviation of x. c. Find the z-score for the value xequals=103.5 d. Find the approximate probability that the number of households that use the Internet for banking in a sample of 1000 is less than or equal to 103