Hi, this is my question below. Thank you in advance:

Let x be a random variable that represents white blood cell count per cubic milliliter of whole blood. Assume that x has a distribution that is approximately normal, with mean = 7850 and estimated standard deviation = 2500. A test result of x < 3500 is an indication of leukopenia. This indicates bone marrow depression that may be the result of a viral infection.

1. What is the probability that, on a single test, x is less than 3500? (Round your answer to four decimal places.)

2. What is the probability of x < 3500? (Round your answer to four decimal places.)

3 .Repeat part (2) for n = 3 tests taken a week apart. (Round your answer to four decimal places.)