The variable, z, has a standard normal distribution. Calculate the probability that The variable, x, has a standard normal distribution. Calculate the probability that (a) x is within 1.5 standard...

The variable, z, has a standard normal distribution. Calculate the probability that

The variable, x, has a standard normal distribution. Calculate the probability that (a) x is within 1.5 standard deviations of the mean (b) x is more than 1.75 standard deviations from the mean.