Find the z-score such that: (a) The area under the standard normal curve to its left is 0.6904 z =  (b) The area under the standard normal curve to its left is 0.9361 z =  (c) The area under the standard normal curve to its right is 0.1835 z =  (d) The area under the standard normal curve to its right is 0.3356 z =

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