Find the following z values for the standard normal variable Z. (You may find it useful to reference the z table. Negative values should be indicated by a minus sign. Round your answers to 2 decimal places.)           a. P(Z ≤ z) = 0.9863   b. P(Z > z) = 0.6905   c. P(−z ≤ Z ≤ z) = 0.97   d. P(0 ≤ Z ≤ z) = 0.306

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