8. What is the z-score of x = 9 if it is 1.5 standard deviations to the left of the mean? a. z = + 1.50 b. z = - 1.50 C. z= 0 d. z = None of the above 9. What is the z-score of x = 7 if it is 0 standard deviations to the left of the mean? a. z = +1.00 b. z = -1.00 C. Z= 0 d. z = None of the above 10. Suppose a normal distribution has a normal distribution with a u = 25 and a standard deviation o = 5. Between what values of x do 95% of the values lie? a. 20 and 30 b. 35 and 45 c. 15 and 25 d. 15 and 35