σ = sqrt[ P * ( 1 - P ) / n ] = sqrt [(0.8 * 0.2) / 100] = sqrt(0.0016) = 0.04

Question

z = (p - P) / σ = (.73 - .80)/0.04 = -1.75. What type of formula is this problem?

Answer 1

Statistical?

Answer 2

express the square root of 0.0016 in standard form