Industrial quality control programs often include inspection of incoming materials from suppliers. if parts are purchased in large lots, a typical plan might be to select 20 parts at random from a lot and inspect them. a lot might be judged acceptable if one or fewer defective parts are found among those inspected. otherwise, the lot is rejected and returned to the supplier. find the probability of accepting lots that have the given percentage of defective parts. (round your answers to three decimal places.)
(hint: identify success with a defective part.)

(a) 5% defective parts
p(lot will be accepted) =

(b) 15% defective parts
p(lot will be accepted) =

(c) 20% defective parts
p(lot will be accepted) =

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?

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