a) Assume that x has a normal distribution with the specified mean and standard deviation. Find the indicated probability. (Round your answer to four decimal places.)μ = 4; σ = 6P(1 ≤ x ≤ 13) =b) Assume that x has a normal distribution with the specified mean and standard deviation. Find the indicated probability. (Round your answer to four decimal places.)μ = 103; σ = 20P(x ≥ 120) =c) Find z such that 5% of the standard normal curve lies to the left of z. (Round your answer to three decimal places.)z = d) Find z such that 4.0% of the standard normal curve lies to the left of z. (Round your answer to two decimal places.)z = e) Find z such that 8% of the standard normal curve lies to the right of z. (Round your answer to two decimal places.)z =