Find the associated z-score or scores that represent the following standard normal areas. (Hint: Use the Excel function =NORM.S.INV() to find the z-score.)   a. Middle 50 percent. (Negative values should be indicated by a minus sign. Round your answers to 4 decimal places.) z-score with lower tail: z-score with upper tail:   b. Lowest 5 percent. (Negative values should be indicated by a minus sign. Round your answer to 4 decimal places.) z-score:    c. Middle 90 percent. (Negative values should be indicated by a minus sign. Round your answers to 4 decimal places.) z-score with lower tail: z-score with upper tail:

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A:

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