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4. It is claimed that 90% of express mail within the same city is delivered within...

4. It is claimed that 90% of express mail within the same city is delivered within 3 working days of the time of mailing. Ten letters are randomly sent to different locations.

• What is the probability that at least two letters arrive within 3 days?

• Find the mean and the standard deviation of the number of letters that will arrive after 3 days.

Math   Statistics-And-Probability   
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Answer #1

A)

probability that at least two letters arrive within 3 days ,

b)

probability of getting letter after 3 days is q=1-p = 1-0.9 = 0.1

mean = n*q=10*0.1=1

standard deviation = == 0.94868

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