The acceptable level for insect filth in a certain food item is 4 insect fragments (larvae, eggs, body parts, and so on) 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

x=4.8 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

4.8 insect fragments?

P(x4.8)=