The gestation period of humans follows a normal distribution with a mean of 266 days and a standard deviation of 16 days. Solve for the probability that a random sample of 20 pregnancies has a mean gestation period of 260 days or less. O P(Z>-1.68) = 0.9535 O P(Z< 1.68) = 0.9535 O P(Z < –1.68) = 0.0465 %3D O P(Z> 1.68) = 0.0465

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