Suppose that the speeds of cars travelling on California freeways are normally distributed with a mean of 57 miles/hour. The highway patrol's policy is to issue tickets for cars with speeds exceeding 80 miles/hour. The records show that exactly 1% of the speeds exceed this limit. Find the standard deviation of the speeds of cars travelling on California freeways. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place. W miles/hour

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 26PFA
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Suppose that the speeds of cars travelling on California freeways are normally distributed with a mean of 57 miles/hour. The
highway patrol's policy is to issue tickets for cars with speeds exceeding 80 miles/hour. The records show that exactly 1% of
the speeds exceed this limit. Find the standard deviation of the speeds of cars travelling on California freeways. Carry your
intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
| miles/hour
Transcribed Image Text:Suppose that the speeds of cars travelling on California freeways are normally distributed with a mean of 57 miles/hour. The highway patrol's policy is to issue tickets for cars with speeds exceeding 80 miles/hour. The records show that exactly 1% of the speeds exceed this limit. Find the standard deviation of the speeds of cars travelling on California freeways. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place. | miles/hour
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