1.If the total cholesterol values for a certain population are approximately normally distributed with a mean of 200 mg/100 ml and a standard deviation of 20 mg/ 100 ml; find the probability that an individual picked at random from this population will have a cholesterol value:

a. Between 180 and 200 mg/100 ml

b. Greater than 215 mg/100 ml

c. Less than 150 mg/100 ml

d. Between 190 and 205/ mg/100 ml

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