The amounts of time required for room-service delivery at Radisson Hotels, are N

Question

The amounts of time required for room-service delivery at Radisson Hotels, are Normally Distributed with the average delivery time of 20 minutes. A random sample of 21 deliveries was selected and its Standard Deviation was found to be 12.69 minutes. Find the Probability that the average delivery time of selected deliveries is over 27 minutes. 0.01 0.025 0.99 None of the above A random sample of 12 deliveries was selected and its Standard Deviation was found to be 7.87 minutes. Find the Probability that the average delivery time of selected deliveries is less than 25 minutes. 0.025 0.995 0.975 None of the above

Explanation / Answer

Answer to 2)

n=12

Stdev = 7.87

Mean = 20

P(X<25) = ?

P(X<25) = P(t<(25-20)/(7.87/sqrt(12))) = P(t<2.2)

The P-Value is .025043.

Answer is 1

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