The probability that a standard normal random variable Z takes a value in the union of intervals (00, a] U [(L, 00), which arises in applications, will be denoted P(Z S a or Z 33 (1.). Use Figure A2 to nd the following probabilities of this type. Sketch the density curve with relevant regions shaded to illustrate the computation. Because of the symmetry of the standard normal density curve, you need to use Figure A2 only one time for each part. a. P(Z 2.58) b. P(Z 2.81) c. P(Z 1.65) d. P(Z 2.43)