Question 249288
the mean daily training distance covered by marathon runners is 10.6 miles with a standard deviation of 2.5 miles. 
if the sample of 35 marathon runners is selected, what is the probability that the mean training distance is grater then 10 miles?
----------------------------------------
Find the z-value of 10:
z(10) = (10-10.6)/2.5 = -0.24
------------------------------
P(x>10) = P(z>-0.24) = 0.5948..
Cheers,
Stan H.