A sample of 4 different calculators is randomly selected from a group containing 20 that are defective and 37 that have no defects. Find the probability that at least one of the calculators is defective. Round to the nearest thousandth.
A sample of 4 different calculators is randomly selected from a group containing
20 that are defective and
37 that have no defects.
Find the probability that at least one of the calculators is defective. Round to the nearest thousandth.
(201)⋅(373)(574)=20⋅373⋅362⋅351574⋅563⋅552⋅541=4⋅20⋅37⋅36⋅3557⋅56⋅55⋅54=0.39340776183≈0.393(39.3 %)