Assume that a continuous variable of a given population is normally distributed with a mean of 70 and a standard deviation of 15. The proportion of the population that has a value for the variable between 65 and 75 is equal to: Question 6 Answer a. None of the options listed are correct b. P(x < 65) - P(x < 75) c. All of the options, except for "None of the options", is correct d. P(z < -0.33) - P(z < 0.33) e. P(65 < x < 75)