a Assume the resting heart rates for a sample of individuals are normally distributed with a mean of 65 and a standard deviation of 5. Use the 68-95-99.7 rule to find the following quantities a. The relative frequency of ratos less than 75 using the 68-95-99.7 rule is (Round to three decimal places as needed.) b. The relative frequency of raten greater than 70 using the 68-95-99.7 rules I. (Round to three decimal places as needed.) 6. The relativo frequency of rotos between 55 and 65 using the 68-96-99.7 rule (Round to three decimal places as needed)