The weights, X grams, of bars of soap are normally distributed with mean 125 grams and standard deviation 4.2 grams.

1. Find the probability that a randomly chosen bar of soap weighs more than 128 grams.
2. Find the value of k such that P(k < X < 128) = 0.7465.
3. Five bars of soap are chosen at random. Find the probability that more than two of the bars each weigh more than 128 grams.