The mean clotting time of blood is 7.45 seconds with a standard deviation of 3.6 seconds. What is the probability that an individual’s clotting time will be less than 2 seconds or greater than 11?

Answer 1

Convert 2 and 11 to their z-values

z = (2 - 7.45)/3.6

Use z-table or technology to find area to left of x for 2 and to the right of the z-value for 11