a) An unknown distribution has a mean of 80 and a standard deviation of 12. A Sample size of 95 is drawn randomly from the population. Fin the sun that is 1.6 standard deviations below the mean of the sums.

b) An unknown distribution has a mean of 80 and a standard deviation of 12. A sample size of 95 is drawn randomly from the population. Find the probability that the sum of the 95 values is less than 7,250.

c) An unknown distribution has a mean 12 and a standard deviation of one. A sample size of 25 is taken. Let X= the object of interest. What is P(Ex > 310)?

d) An unknown distribution has a mean of 100, a standard deviation of 100, and a sample size of 100. Let X= one object of interest. What is p(Ex > 9400)?