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 u=6600 and estimated standard deviation =2350 . A test result of x

(a) What is the probability that, on a single test, x is less than 3500? (Round your answer to four decimal places.) (b) Suppose a doctor uses the average x for two tests taken about a week apart. What can we say about the probability distribution of x? The probability distribution of x is approximately normal with My = 6600 and ox = 1661.70. The probability distribution of x is approximately normal with My = 6600 and ox = 1175.00. The probability distribution of x is not normal. The probability distribution of x is approximately normal with My = 6600 and oy = 2350. What is the probability of x