Can someone help me figure out b. and c.? I understand a. bu the others are confusing for me to understand.
The mean amount of time it takes a kidney stone to pass is 13 days and the standard deviation is 4 days. Suppose that one individual is randomly chosen. Let X = time to pass the kidney stone. Round all answers to 4 decimal places where possible.
a. What is the distribution of X? X ~ N(13 , 4)
b. Find the probability that a randomly selected person with a kidney stone will take longer than 15 days to pass it.
c. Find the minimum number for the upper quarter of the time to pass a kidney stone.
days.