Now it is thought that this sample is truly indicative of th

Now it is thought that this sample is truly indicative of the population of smokers whose mean is 129.2 mm Hg, and now if one person is randomly selected from the population,

- What is the probability that this person will have a systolic blood pressure greater than that determined for the smokers of part (a) 134 mm Hg? (3)

- Prepare the appropriate PDF for this question. (1)

Solution

- What is the probability that this person will have a systolic blood pressure greater than that determined for the smokers of part (a) 134 mm Hg? (3)

As we know the mean of population 129.2 we can use normal distribution but you dont give me the SD s we are going to assume that is 2

P( z > [134-129.2] / 2 )

P( z >2.4)

using the tables of normal distribution is the probability is

P( z > 2.4) = 0.00820