Find the mean number of letters

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The United States Postal Service reports 93 percent of first class mail within the same city is delivered within two days of the time of mailing. Six letters are randomly sent to different locations.

a. What is the probability that all six arrive within two days?

b. Find the mean number of letters that will arrive within two days.

If the normal defect rate for Piper Aztec airplanes is 6%, what's the probability that in a production of 40 planes at least one will be defective?

Reference no: EM132858182

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