4.15. What proportion of a normal distribution falls in the following ranges? (a) Above a z-score of

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4.15. What proportion of a normal distribution falls in the following ranges?

(a) Above a z-score of 2.10

(b) Below a z-score of-2.10

(c) Above a z-score of —2.10

(d) Between z-scores of -2.10 and 2.10

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