1. Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance. Now imagine repeating the survey many, many times, each time recording a different sample mean commute distance. In the long run, a histogram of these sample means represents
A. the bias, if any, which is present in the sampling method.
B. the true population average commute distance.
C. a simple random sample.
D. the sampling distribution of the sample mean.
2. The distribution of actual weights of 8 oz. wedges of cheddar cheese produced at a dairy is Normal with mean 8.1 ounces and standard deviation 0.1 ounces.
Reference: Ref 11-5
If a sample of five of these cheese wedges is selected, the probability that their average weight is less than 8 oz is (Use Table A)
A. 0.0125.
B. 0.1853.
C. 0.4871.
D. 0.9873.