A recent study of the hourly wages of a company's maintenance crews found that the average hourly wage was $16.50; and the standard deviation was $3.50. If one were to choose a member of these crews at random : 1) What would be the probability that he or she would earn between $16.50 and $20 per hour? 2) What would be the probability that he/she earns more than $20.00 per hour? 3) What would be the probability that he earns less than $15 per hour? 4) What would be the probability that he earns more than $16, but less than $18.5 per hour?

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