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Chapter 2: Q 1.3. (page 89)

About what percent of calls lasted less than 30 minutes? 30 minutes or more?

Short Answer

Expert verified

65 percent of the calls lasted less than 30 minutes, while 35 percent lasted longer.

Step by step solution

01

Step 1. Given

Graph of call length (minutes) Vs cumulative frequency (%)

02

Step 2. Concept

A cumulative relative frequency graph can be used to depict an individual's location within a distribution or to find a specific percentile within the distribution.

03

Step 3. Explanation

The graph shows that 65 percent of the calls were less than 30 minutes in length. And about a third of the calls lasted more than 30 minutes.

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Most popular questions from this chapter

Foreign-born residents The percentile plot below shows the distribution of the percent of foreign-born residents in the 50 states.

(a) The highlighted point is for Maryland. Describe what the graph tells you about this state.

(b) Use the graph to estimate the 30th percentile of the distribution. Explain your method.

If Mrs. Navard had the entire class stand on a 6-inch-high platform and then had the students measure the distance from the top of their heads to the ground, how would the shape, center, and spread of this distribution compare with the original height distribution?

Estimate Q1, Q3, and the IQR of the distribution.

Weights aren’t Normal The heights of people of the same gender and similar ages follow Normal distributions reasonably closely. Weights, on the other hand, are not Normally distributed. The weights of women aged 20 to 29 have mean 141.7 pounds and median 133.2 pounds. The first and third quartiles are 118.3 pounds and 157.3 pounds. What can you say about the shape of the weight distribution? Why?

The proportion of observations from a standard Normal distribution with values less than 1.15 is

(a) 0.1251.

(b) 0.8531.

(c) 0.8749.

(d) 0.8944.

(e) none of these.
See all solutions

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