help 6,7,8

QUESTION 6 Suppose that total cholesterol in US men aged 35-44 can be modeled by a normal distribution with mean y = 205 mg/dL, and standard deviation = 37.8. What is the probability that a randomly selected man in that age group has a cholesterol level between 201.5 and 246.72 QUESTION 7 Suppose that total cholesterol in US men aged 35-44 can be modeled by a normal distribution with mean = 205 mg/dL, and standard deviation = 37.8. What is the probability that a randomly-selected man in that age group has a cholesterol level less than 198.6? QUESTIONS Suppose that total cholesterol in US men aged 35-44 can be modeled by a normal distribution with mean u = 205 mg/dL., and standard deviation 0 = 37.8. What is the probability that a randomly-selected man in that age group has a cholesterol level more than 174.5? a