I need help with question D. But please explain the process on how to do it in a TI-84 calculator. Or any type of calculator

Applying the Central Limit Theorem: The amount of contaminants that are allowed in food products is determined by the FDA (Food and Drug Administration). Common contaminants in cow milk include feces, blood, hormones, and antibiotics, The current amount of somatic cells (common name "pus") allowed in 1 cc of cow milk is currently set at 7510,000. Suppose a random sample of 40 1 cc specimens is gathered and results in a sample mean of 777602 pus cells. a. Why is the sampling distribution approximately normal? (2 points) sample size is big enough for population mean. b. Assuming a population mean of 750,000 cells and a population standard deviation of 85000 cells: What is the mean of the sampling distribution? (2 points) 750,000 c. What is the standard deviation of the sampling distribution? (2 points) 13439.68006 13439.680055716 d. What is the probability that a simple random sample of 40 1 cc specimens has a mean of at least 777602 pus cells? (6 points) e. Is this unusual? Use the rule of thumb that events with probability less than 5% are considered unusual. (2