A shipment of 10 microwave ovens contains 3 defective units. A restaurant buys four of these units. What is the probability of the restaurant buying at least three nondefective​ units? The probability of the restaurant buying at least three nondefective units is?   ​(Round to three decimal places as​ needed.)

An urn contains 4 white balls and 6 red balls. A second urn contains 7 white balls and 3 red balls. An urn is selected, and a ball is randomly drawn from the selected urn. The probability of selecting the first urn is 0.4. If the ball is white, find the probability that the second urn was selected. (Round your answer to three decimal places.)

A shipment of 10microwave ovens contains 2defective units. A restaurant buys four of these units. What is the probability of the restaurant buying at least threenondefective​ units? The probability of the restaurant buying at least three nondefective units is? ​(Round to three decimal places as​ needed.)

A pharmacist receives a shipment of 20 bottles of a drug and has 4 of the bottles tested. If 4 of the 20 bottles are contaminated, what is the probability that more than 1 of the tested bottles is contaminated? Express your answer as a fraction or a decimal number rounded to four decimal places.