For a standard normal distribution, determine the probabilities in parts a through d below. Click here to view page 1 of the standard normal probability table. Click here to view page 2 of the standard normal probability table. a. Find P(z1.58). P(z1.58)= (Round to four decimal places as needed.) b. Find P(z1.21). P(z1.21)= (Round to four decimal places as needed.) c. Find P(0.89z1.75). P(0.89z1.75)= (Round to four decimal places as needed.) d. Find P(0.39z2.12). P(0.39z2.12)= (Round to four decimal places as needed.).