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One environmental group did a study of recycling habits in a california community. It found that 70% of the aluminum cans sold in the area were recycled with standard deviation of 15%.

(a) if 400 cans are sold today, what is the probability that 300 or more will be recycled?
(b) of the 400 cans sold, what is the probability that between 200 and 300 will be recycled?

Sagot :

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