/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q 3. Speed limits According to the Lo... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 2: Q 3. (page 103)

Speed limits According to the Los Angeles Times, speed limits on California highways are set at the 85th percentile of vehicle speeds on those stretches of road. Explain what that means to someone who knows little statistics.

Short Answer

Expert verified

85% of California vehicle speeds on those stretches of road are within the speed limits

Step by step solution

01

Step 1. Given

Speed limits on California highways are set at the 85th percentile of vehicle speeds on those stretches of road.

02

Step 2. Concept 

A score in the 95th percentile is a figure on a scale of 100 that represents the percent of a distribution that is equal to or below it.

03

Step 3. Explanation

The 85th percentile of vehicle speeds is used to set speed restrictions. Typically, the speed limit is established at the distance between the bottom 85 percent and the top 15% of vehicle speeds. That is, on particular stretches of road, 85% of California vehicle speeds are within the speed limits.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Old folks Here is a stem plot of the percent of residents aged 65 and older in the50states:

(a) Find and interpret the percentile for Colorado, which has 10.1%of its residents aged 65or older.

(b) Find and interpret the percentile for Rhode Island, with 13.9%of residents aged 65or older.

(c) Which of these two states is more unusual? Explain.

The proportion of observations from a standard Normal distribution with values larger than 鈭�0.75is

(a)0.2266. (c) 0.7734. (e) none of these

(b)0.7422. (d) 0.8023.

Travel time (1.2) The dot plot below displays data on students鈥� responses to the question 鈥淗ow long does it usually take you to travel to school?鈥� Describe the shape, center, and spread of the distribution. Are there any outliers?

Growth charts We used an online growth chart to find percentiles for the height and weight of a 16-year-old girl who is 66 inches tall and weighs 118 pounds. According to the chart, this girl is at the 48th percentile for weight and the 78th percentile for height. Explain what these values mean in plain English.

The distribution of heights of adult American men is approximately Normal with mean of 69inches and a standard deviation of 2.5inches. Draw a Normal curve on which this mean and standard deviation are correctly located. (Hint: Draw the curve first, locate the points where the curvature changes, and then mark the horizontal axis.

(a) What per cent of men are taller than 74inches?

(b) Between what heights do the middle 95%of men fall?

(c) What per cent of men are between 64and 66.5inches tall?

(d) A height of 71.5inches corresponds to what percentile of adult male American heights?
See all solutions

Recommended explanations on Math Textbooks

Calculus

Read Explanation

Probability and Statistics

Read Explanation

Theoretical and Mathematical Physics

Read Explanation

Statistics

Read Explanation

Pure Maths

Read Explanation

Mechanics Maths

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.