Based on the findings, the average monthly salary of 800 college professors in the university belt area is normally distributed with a mean of Php 55,000.00 and a standard deviation of Php. 5,000.00. Find: (a) The z-score of a professor with an income of Php 65,000.00 (b) The probability that a randomly selected professor has a monthly salary of Php 60,000.00 (c) The probability that a randomly selected professor has a monthly salary between Php 45,000.00 and Php 58,000.00.

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