Author Question: A videotape store has an average weekly gross of 1,158 with a standard deviation of 120 . Let x be ... (Read 125 times)

lidoalex · **on:** Jun 24, 2018

A videotape store has an average weekly gross of 1,158 with a standard deviation of 120 . Let x be the store's gross during a randomly selected week. If this is a normally distributed random variable, then the number of standard deviations from 1,158 to 1,360 is:
a. 0.4535.
b. 0.0465.
c. 20.98.
d. 1.683.
e. none of these.

Question 2

Which of the following is not a characteristic for a normal distribution?
a. It is symmetrical distribution
b. The mean is always zero
c. The mean, median, and mode are all equal
d. It is a bell-shaped distribution
e. The area under the curve always equals 1.0