×
Get Full Access to Elementary Statistics: Picturing The World - 6 Edition - Chapter 5.r - Problem 48e
Get Full Access to Elementary Statistics: Picturing The World - 6 Edition - Chapter 5.r - Problem 48e

×

# Answer: In Exercise, use the following information. On a ISBN: 9780321911216 66

## Solution for problem 48E Chapter 5.R

Elementary Statistics: Picturing the World | 6th Edition

• Textbook Solutions
• 2901 Step-by-step solutions solved by professors and subject experts
• Get 24/7 help from StudySoup virtual teaching assistants Elementary Statistics: Picturing the World | 6th Edition

4 5 1 323 Reviews
18
3
Problem 48E

Problem 48E

In Exercise, use the following information. On a dry surface, the braking distances (in feet), from 60 miles per hour to a complete stop, of a sedan can be approximated by a normal distribution, as shown in the figure at the left. What braking distance of a sedan represents the third quartile?

Step-by-Step Solution:

Solution :

Step 1 of 1:

The braking distances (in feet), from 60 miles per hour to a complete stop, of a sedan can be approximated by a normal distribution, the graph is Our goal is:

We need to find braking distance of a sedan represents the third quartile.

From the given information the third quartile has a probability or area of 75% or 0.75 to its left.

Now we have to determine the z-score corresponding to the probability of 0.75.

Using area under the normal curve table,

z = 0.68

Then the value corresponding to the z-score is the mean increased by the product of the z-score and the standard deviation.

z = 0.68 =    129.5908

Therefore, braking distance of a sedan represents the third quartile is 129.5908.

Step 2 of 1

##### ISBN: 9780321911216

Unlock Textbook Solution