The number of turns of a pencil sharpener needed to sharpen a brand W pencil is approximately Normally
distributed with a mean of 4.6 and a standard deviation of 0.67. The number of turns needed to sharpen a brand H
pencil is approximately Normally distributed with a mean of 5.2 and a standard deviation of 0.33. If 30 pencils of
each brand are randomly selected and sharpened, what is the probability that the brand W pencils will have a
higher mean number of turns needed to sharpen than brand H?
approximately 0
0.0005
0.9995
approximately 1