Feature movie lengths (in hours) were measured for all movies shown in the past year in the U.S. The mean length of all feature length movies shown was 1.80 hours with a standard deviation of 0.15 hours, and it is normally distributed. Suppose the length of a random sample of 20 movies was recorded from all movies released this year, andthe process of taking random samples of size 20 is repeated 200 times, then a histogram of the 200 sample means is created.

What do you expect forthe mean and standard deviation of that distribution?

Select one:

a.The mean length would be 1.80 hours with a standard deviation of 0.18 hours.

b.The mean length would be 1.80 hours with a standard deviation of 0.15 hours.

c.The mean length would be 1.72 hours with a standard deviation of 0.18 hours.

d.The mean length would be 1.80 hours with a standard deviation of 0.034 hours.