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Section 6.2 Homework
7. Suppose that a recent poll found that % of adults believe that the overall state of moral values is poor. Complete parts (a) through (c).
(a) For 450 randomly selected adults, compute the mean and standard deviation of the random variable X, the number of adults who believe that the overall state of moral values is poor.
The mean of X is
The standard deviation of X is
(b) Interpret the mean. Choose the correct answer below.
- For every 450 adults, the mean is the number of them that would be expected to believe that the overall state of moral values is poor.
- For every 450 adults, the mean is the minimum number of them that would be expected to believe that the overall state of moral values is poor.
- For every 450 adults, the mean is the range that would be expected to believe that the overall state of moral values is poor.
- For every 297 adults, the mean is the maximum number of them that would be expected to believe that the overall state of moral values is poor.
(c) Would it be unusual if 315 of the 450 adults surveyed believe that the overall state of moral values is poor?
- No
- Yes