Assume we have a population of scores with mean (µ) of 975 and standard deviation (s) of 15. Suppose that the distribution is normal. Provide answers to the following questions:
What percentage of population will lie between 960 and 990?
What percentage of population will lie below 975?
What percentage of population will lie below 990?
What two values of X (the counts) would encompass the middle 50 percent of scores?