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?
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?