Exercises with a (standard) normal distribution: A. What z-score is associated with 50% probability? B. What is the probability of having a z-score > 1? P(Z > 1)= C. What is the probability of having a z-score < 1? P(Z < 1)= D. What is the probability of being within 1 standard deviation of the mean? P(-1 < Z < 1) = E. Suppose mean systolic blood pressure is normally distributed with a mean of 129 mm Hg and standard deviation of 19.8. What is the probability that a randomly selected person has a systolic blood pressure greater than or equal to 150 mm Hg? F. What value cuts off the upper 2.5% of the systolic blood pressure curve? (hint: first find the z- value, then solve for X). G. Is it unusual for someone to have a systolic blood pressure below 95? H. Is it unusual for someone to have a systolic blood pressure above 95?