Blank 4: what value is one standard deviation below the mean in the distribution of sample sums described above?

You draw one sample of size 75 from a population with a mean of 500 and a standard deviation of 50. Blank 1: What is the probability that sum of your sample will be less than 38000? Round your answer for Blank 1 to three decimal places. Examples 0.156 0.480 0.9834 would be entered as 0.983 If you drew samples of this size repeatedly, computing the sum each time, what range of values would you expect to contain 95 percent of the sample sums? Enter the lower value of your range in Blank 2. Enter the upper value of your range in Blank 3