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a. The relative frequency of rates less than 95 using the 68-95-99.7 rule is n

(Round to three decimal places as needed.)

b. The relative frequency of rates greater than 80 using the 68-95-99.7 rule is n.

(Round to three decimal places as needed.)

c. The relative frequency of rates between 35 and 65 using the 68-95-99.7 rule is n

(Round to three decimal places as needed.)