Problem 7.013 a random sample of size n1 = 16 is selected from a normal population with a mean of 73 and a standard deviation of 9. a second random sample of size n2 = 8 is taken from another normal population with mean 70 and standard deviation 11. let upper x overscript bar endscripts subscript 1and upper x overscript bar endscripts subscript 2 be the two sample means. find: (a) the probability that upper x overscript bar endscripts subscript 1 baseline minus upper x overscript bar endscripts subscript 2 exceeds 3. (b) the probability that 4.9 less-than-or-equal-to upper x overscript bar endscripts subscript 1 baseline minus upper x overscript bar endscripts subscript 2 baseline less-than-or-equal-to 5.7.