SOLUTION: On the daily run of an express bus, the average number of passengers is 48. The standard deviation is 3. Assume the variable is normally distributed. Find the probability that the

Algebra ->  Probability-and-statistics -> SOLUTION: On the daily run of an express bus, the average number of passengers is 48. The standard deviation is 3. Assume the variable is normally distributed. Find the probability that the       Log On


   

Question 687044: On the daily run of an express bus, the average number of passengers is 48. The standard deviation is 3. Assume the variable is normally distributed. Find the probability that the bus will have between 36 and 40 passengers.
Answer by stanbon(75887) About Me  (Show Source):
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On the daily run of an express bus, the average number of passengers is 48. The standard deviation is 3. Assume the variable is normally distributed. Find the probability that the bus will have between 36 and 40 passengers.
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Find the z-values for 36 and for 40.
Find the probability that z lies between those two z-values.
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Using a TI-84 I get P(36<= x <=40) = 0.0038
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Cheers,
Stan H.