A sample of 100 over-all travel speed was observed on a four-lane, undivided Arterial Street. The sample mean was 35.45 mph, and the standard deviation of the sample was 5.20 mph. Assume that the sample of travel speeds was taken from a normal population. a) Find the percentage of vehicles in the population traveling between 33 and 44 mph. b) Between what limits may the mean of the population be expected to fall for a 95 percent level of confidence?

A sample of 100 over-all travel speed was observed on a four-lane, undivided Arterial Street. The sample mean was 35.45 mph, and the standard deviation of the sample was 5.20 mph. Assume that the sample of travel speeds was taken from a normal population. a) Find the percentage of vehicles in the population traveling between 33 and 44 mph. b) Between what limits may the mean of the population be expected to fall for a 95 percent level of confidence?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Fundamental principles of travel flow

To better represent the flow, the traffic flow is generally constrained along a one-dimensional pathway, like a travel lane and various relationships have been established, some of the relationships are outlined below.

Question

A sample of 100 over-all travel speed was observed on a four-lane, undivided Arterial Street.
The sample mean was 35.45 mph, and the standard deviation of the sample was 5.20 mph.
Assume that the sample of travel speeds was taken from a normal population.
a) Find the percentage of vehicles in the population traveling between 33 and 44 mph.
b) Between what limits may the mean of the population be expected to fall for a 95 percent
level of confidence?

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