QUESTION 5 [4]
A courier service company has found that their delivery time of
parcels to clients...
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QUESTION 5 [4]
A courier service company has found that their delivery time ofparcels to clients is approximately normally distributed with amean delivery time of 30 minutes and a variance of 25 minutes(squared).
a) What is the probability that a randomly selected parcel willtake between 26 and 42 minutes to deliver? (2)
b) What is the maximum delivery time (minutes) for the 2.5% ofparcels with the shortest time to deliver? (2)
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Solution We are givena We are required to findUsing the zscore formula we haveUsing the
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