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Suppose the average speeds of passenger trains traveling from Newark, New Jersey, to Philadelphia, Pennsylvania, are...

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Statistics

Suppose the average speeds of passenger trains traveling fromNewark, New Jersey, to Philadelphia, Pennsylvania, are normallydistributed, with a mean average speed of 88 miles per hour and astandard deviation of 6.4 miles per hour.

(a) What is the probability that a train will average less than72 miles per hour?

(b) What is the probability that a train will average more than80 miles per hour?

(c) What is the probability that a train will average between 91and 99 miles per hour?

(Round the values of z to 2 decimal places. Round your answersto 4 decimal places.)

(a) P(x < 72)=???

(b) P(x > 80)=???

(c) P(91 ≤ x ≤ 99)=???

Answer & Explanation Solved by verified expert
4.5 Ratings (628 Votes)
Solution Given that mean 88standard deviation 64a    See Answer
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