Chapter 8.1, Problem 22E

a.

To determine

Iswind speed a function of advisory number?

Answer to Problem 22E

Yes, the wind speed is a function of advisory number.

Explanation of Solution

Given:

In 1995, a total of 32 regular weather advisories were issued during the storm that became hurricane Opal. The graph shows the wind speed inside Opal at the time of each advisory.

Calculation:

Open looking at our given graph, we can see that the horizontal axis represents advisory number and vertical axis represents wind speed.

We can see that each advisory number corresponds to a specific wind speed.

Therefore, the wind speed is a function of advisory number.

b.

To determine

An ocean storm is considered a hurricane if its wind speed is at least 74 miles per hour. For which advisories did Opal qualify as a hurricane?

Answer to Problem 22E

Opal qualifies as a hurricane for 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30 number advisories.

Explanation of Solution

Given:

In 1995, a total of 32 regular weather advisories were issued during the storm that became hurricane Opal. The graph shows the wind speed inside Opal at the time of each advisory.

Calculation:

First of all, we will draw a horizontal line at $y=75$ as shown below:

We can see that the advisories with number 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30 has wind speed greater than 74 miles per hour.

Therefore, Opal qualifies as a hurricane for 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, and 30 number advisories.