In a Box of 8 Batteries,5 Are Dead

question 104

Multiple Choice

In a box of 8 batteries,5 are dead.You choose two batteries at random from the box.Let the random variable X be the number of good batteries you get.Find the standard deviation of of X.

• A)σ = 0.78
• B)σ = 0.40
• C)σ = 0.47
• D)σ = 0.59
• E)σ = 0.63

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Definitions:

Dependent Variable

The variable in an experiment that is expected to change as a result of manipulations of the independent variable.

Positive Correlation

An association between increases in one variable and increases in another—or between decreases in one and in another.

Height And Weight

Physical measurements that indicate the vertical stature and mass of a body, often used in assessing health and development.

Average Income

The sum of all incomes in a group divided by the number of individuals in that group, often used as an economic indicator.