The distribution of passenger vehicle speeds traveling on the Interstate 5 Freeway (I-5) in California is nearly normal with a mean of 71.7 miles/hour and a standard deviation of 5.9 miles/hour. (a) What proportion of passenger vehicles travel slower than 85 miles/hour? (b) What proportion of passenger vehicles travel between 56 and 83 miles/hour? (c) How fast do the fastest 15% of passenger vehicles travel? miles/hour

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Chapter 3: Distributions of Random Variables OPEN
I am finished
Speeding on the I-5
The distribution of passenger vehicle speeds traveling on the Interstate 5 Freeway (I-5) in California is nearly normal
with a mean of 71.7 miles/hour and a standard deviation of 5.9 miles/hour.
(a) What proportion of passenger vehicles travel slower than 85 miles/hour?
(b) What proportion of passenger vehicles travel between 56 and 83 miles/hour?
(c) How fast do the fastest 15% of passenger vehicles travel?
miles/hour
(d) Find a value k so that 75% of passanger vehicles travel at speeds within k miles/hour of 71.7mph. k =
(e) The speed limit on this stretch of the I-5 is 70 miles/hour. Approximate what
percentage
of the
passenger
vehicles
travel above the speed limit on this stretch of the I-5.
Submit answer
US 0 10:30
acer
Transcribed Image Text:Chapter 3: Distributions of Random Variables OPEN I am finished Speeding on the I-5 The distribution of passenger vehicle speeds traveling on the Interstate 5 Freeway (I-5) in California is nearly normal with a mean of 71.7 miles/hour and a standard deviation of 5.9 miles/hour. (a) What proportion of passenger vehicles travel slower than 85 miles/hour? (b) What proportion of passenger vehicles travel between 56 and 83 miles/hour? (c) How fast do the fastest 15% of passenger vehicles travel? miles/hour (d) Find a value k so that 75% of passanger vehicles travel at speeds within k miles/hour of 71.7mph. k = (e) The speed limit on this stretch of the I-5 is 70 miles/hour. Approximate what percentage of the passenger vehicles travel above the speed limit on this stretch of the I-5. Submit answer US 0 10:30 acer
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