Let x denote the IQ for an individual selected at random from a certain population. The value of x must be a whole number. Suppose that the distribution of x can be approximated by a normal distribution with mean value 95 and standard deviation 15. Approximate the probabilities below. (Round all answers to four decimal places.)

(a) P(x = 95) =

Incorrect: Your answer is incorrect.


(b) P(x ? 105) =


(c) P(x < 105) = (Hint: x < 105 is the same as x ? 104.)


(d) P(75 ? x ? 115) =