Find the Range, Variance, and Standard Deviation for Each of the Two

question 66

Multiple Choice

Find the range, variance, and standard deviation for each of the two samples, then compare the two sets of results.
-The manager of a bank recorded the amount of time each customer spent waiting in line during peak business hours one Monday. The frequency distribution below summarizes the results. Find the standard deviation. Round your answer to one decimal place. $$\begin{array}{l}\text { Waiting tim\& Number of }\\\begin{array} { c | c } \text { (minutes } & \text { customer } \\\hline 0 - 3 & 12 \\4 - 7 & 14 \\8 - 11 & 10 \\12 - 15 & 13 \\16 - 19 & 0 \\20 - 23 & 1\end{array}\end{array}$$

• A)4.9
• B)5.2
• C)7.0
• D)4.7

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Definitions:

Hemocoel

The primary body cavity of most invertebrates, particularly those with an open circulatory system, containing circulating fluid (hemolymph) that directly bathes the organs.

Closed Circulatory System

A cardiovascular system where blood is enclosed within blood vessels and circulated throughout the body without direct contact with body tissues.

Amphibian Heart

A three-chambered heart found in amphibians, featuring two atria and one ventricle for circulation.

Circulatory System

The body system responsible for the transport of blood, nutrients, gases, and wastes to and from cells, facilitating the maintenance of internal homeostasis.