Assume a normal distribution and find the following probabilities. (Round the values of z to 2 decimal places. Round your answers to 4 decimal places.) (a) P(x < 18 | = 20 and = 4) enter the probability of fewer than 18 outcomes if the mean is 20 and the standard deviation is 4 (b) P(x 66 | = 50 and = 9) enter the probability of 66 or more outcomes if the mean is 50 and the standard deviation is 9 (c) P(x > 43 | = 50 and = 6) enter the probability of more than 43 outcomes if the mean is 50 and the standard deviation is 6 (d) P(16 < x < 20 | = 18 and = 4) enter the probability of more than 16 and fewer than 20 outcomes if the mean is 18 and the standard deviation is 4 (e) P(x 76 | = 60 and = 2.78) enter the probability of 76 or more outcomes if the mean is 60 and the standard deviation is 2.78