The lengths of adult earthworms are normal with mean 8.6cm. and standard deviation 1.6cm. 40 adult earthworms are chosen at random. Approximate the probability that at lease 18 of them are less than 4.5cm.long.© BrainMass Inc. brainmass.com June 3, 2020, 4:44 pm ad1c9bdddf
The solution discusses the length of the earthworm and the standard deviation.