Question

Suppose that a recent poll found that 45​% of adults believe that the overall state of moral values is poor. Complete parts​ (a) through​ (c).

​(a) For 150 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 ______ (Round to the nearest whole number as​ needed.)

The standard deviation of X is _______. (Round to the nearest tenth as​ needed.)

​(b) Interpret the mean. Choose the correct answer below

A.For every 150 ​adults, the mean is the range that would be expected to believe that the overall state of moral values is poor.

B.For every 68 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.For every 150 adults, the mean is the number of them that would be expected to believe that the overall state of moral values is poor.

D.For every 150 ​adults, the mean is the minimum number of them that would be expected to believe that the overall state of moral values is poor.​(c) Would it be unusual if 61 of the 150 adults surveyed believe that the overall state of moral values is​ poor?

​(c) Would it be unusual if of the 61 of the 150 adults surveyed believe that the overall state of moral values is​ poor?

Yes

No

Answer 1