SOLUTION: Survey Results reveal that 45% of patients screened for a virus test positive. from a random sample of 35 patients, estimate the probability that at most 18 test positive.

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Question 430250: Survey Results reveal that 45% of patients screened for a virus test positive. from a random sample of 35 patients, estimate the probability that
at most 18 test positive.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

Survey Results reveal that 45% of patients screened for a virus test positive

 p = .45  q = .55 

random sample of 35 patients

mean = .55*35 = 16 expected average number to test positive..

SD = sqrt(35*.55*.45) = ~3

P(at most 18 test positive) that is nearly everything left of z=1, or (P = 84%)

Estimate would be somewhat less than that.