Statistics Question

Question

A potential buyer will sample videotapes from a large lot of new video tapes to check for defective tapes. If five percent of the lot is defective and she takes a random sample of 80 tapes, what is the probability that she will find at least 7 defective tapes?

Answer 1

P(x is greater than or equal to 7) = o.10528 or 10.528%

Use 1-binomialcdf trials = 80 p = .05 x = 6