Question

Let the random variable X represent the number of people living in a household in a certain town. The standard deviation of X
is 1.8. Which of the following statements is the best interpretation of the standard deviation?

A.The number of people living in a randomly selected household is expected to be 1.8 people.


B.The number of people living in a randomly selected household will be 1.8 people away from the mean.


C.On average, the number of people living in a household varies from the mean by about 1.8 people.


D.For a random sample of households, the average number of people per household is expected to be 1.8 people.


E. For a random sample of households, the average number of people per household will be 1.8 people away from the mean.

C?

Answers

ashlyn
D i think
Anonymous
Standard deviation is the expected margin from the mean (regardless if positive or negative), so that means the number of people living in a household would typically vary by 1.8 people.
Barry
So what’s the answer?

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