the total cholesterol level ldlhdl20 of triglyceride of us m

the total cholesterol level (ldl+hdl+20% of triglyceride) of us males between 60 an 70 years of age is approximately normally distributed with a mean of 175 mg/100ml and standard deviation of 20 mg/100 ml. find the probability that randomly selected person from this populations has a total cholesterol level:

Solution

P( x >250)

P( z > (250 - 175) / 20 )

P( z> 3.75) = 0.00008