. mean = np = 76(.8) = 60.8
variance = npq = 76(.8)(.2) = 12.16
std. dev. = sqrt 12.16 = 3.49
Can anyone Enlighten me on where the .2 for q comes from if I only know n and p to begin with?
variance = npq = 76(.8)(.2) = 12.16
std. dev. = sqrt 12.16 = 3.49
Can anyone Enlighten me on where the .2 for q comes from if I only know n and p to begin with?
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p= prob of success; prob of failure is 1-p, which is denoted as q. So q=1-p=1-.8=.2.