Let Z denote a standard normal variable. Find P(Z> 1.64)?

Let Z denote a standard normal variable. Find P(-2.00

Let Z denote a standard normal variable. Find P(-2.37

Let Z denote a standard normal variable. Find P(Z> -0.23)?

Suppose a known 10% of computer chips are defective. In a sample of 200 chips, what is the probability the proportion of defective chips is between 0.08 and 0.15?