Justify your answers and detail your calculations briefly. Answers should be brief and well described. Please check the file Question 4: Suppose a simple random sample of size 50 is selected from a

Justify your answers and detail your calculations briefly.  

Answers should be brief and well described.

Please check the file 

Question 4:

In an article about the cost of health care, Money magazine reported that a visit to a hospi-

tal emergency room for something as simple as a sore throat has a mean cost of $328

(Money, January 2009). Assume that the cost for this type of hospital emergency room visit

is normally distributed with a standard deviation of $92. Answer the following questions

about the cost of a hospital emergency room visit for this medical service.

a. What is the probability that the cost will be more than $500?

b. What is the probability that the cost will be less than $250?

c.What is the probability that the cost will be between $300 and $400?