SOLUTION: Systolic blood pressure are assumed to follow a normal distribution with mean of 108 and standard deviation of 14. 1. in random sample of 1000 individuals, how many of them whose

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Question 928059: Systolic blood pressure are assumed to follow a normal distribution with mean of 108 and standard deviation of 14.
1. in random sample of 1000 individuals, how many of them whose blood pressure will be more than 120?
(1)155; (2)195; (3)604; (4)804; (5)904
2. among a random sample of 100 individuals, what is the lowest blood pressure C so that the blood pressure of 10 individuals will be greater than C?
(1)110; (2)115; (3)120; (4)125; (5)130
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Population:mean of 108 and standard deviation of 14.
P( x > 120) = P( z > .8571) = normalcdf(.8571, 100) = .1957 0r 195 people
............
what is the lowest blood pressure C so that the blood pressure of 10 individuals will be greater than C:
14(invNorm(.90) + 108 = 14(1.28) + 108 = 125 (take low Integer in this case)