The acceptable level for insect filth in a certain food item is 5 insect fragments per 10 grams. A simple random sample of 40 ten-gram portions of the food item is obtained and results in a sample mean of = 5.5 insect fragments per ten-gram portion. What is the probability a simple random sample of 40 ten-gram portions of the food item results in a mean of at least 5.5 insect fragments P(a > 5.5)?