For a standard normal distribution (u=0,Q=1) find:
a. The probability of z falling between -1.96 and +1.96
b. The probability of a z falling above 1.96
c. if the probabilty of a z falling a point is 5% what is the z value?
d. The probability of a z falling between two points equidistant from the mean, one to the left of the mean and the other to the right og the mean is 99% what are the z ranges.