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Slices of pizza for a certain brand of pizza have a mass that is approximately normally distributed with a mean of 67.9 grams and a standard deviation of 2.28 grams. a) For samples of size 16 pizza slices, what is the standard deviation for the sampling distribution of the sample mean?' ' b) What is the probability of finding a random slice of pizza with a mass of less than 67.5 grams? \\c) What is the probability of finding a 16 random slices of pizza with a mean mass of less than 67.5 grams? l: d) What sample mean (for a sample of size 16] would represent the bottom 15% (the 15th percentile)? grams