1. A manufacturing process outputs parts having a normal distribution with a mean of 30 cm and standard deviation of 2 cm. From a production sample of 80 parts, what proportion of the sample can be expected to fall between 26 and 34 cm?
95%
50%
90%
68%
2. A process that transforms any normal distribution into one having mean = 0 and standard deviation = 1 is a:
normal approximation to the binomial
permutation
Poisson transformation
Z transformation