Use the following to answer questions 20 and 21: In a large population of adults, the mean IQ is 112 with a standard deviation of 20. Suppose 200 adults are randomly selected for a market research...

Use the following to answer questions 20 and 21:  In a large population of adults, the mean IQ is 112 with a standard deviation of 20.  Suppose 200 adults are randomly selected for a market research campaign.

1. The sampling distribution of the sample mean IQ is:


2. a)  exactly normal, mean 112, standard deviation 20.


3. b)  approximately normal, mean 112, standard deviation 0.1.


4. c)  approximately normal, mean 112, standard deviation 1.414


5. d)  approximately normal, mean 112, standard deviation 10.

The probability that the sample mean IQ is greater than 110 is:

1. a)  079                 b)  0.46                    c)  0.54                      d)  0.921