Need assistance solving the following problem

which illustrates the relative frequencies in a distn'bution of systolic blood pressures for a sample of female students. The distribution has a standard deviation of 15. Consider the normal curve in the gure to the right, a a L' 50 75 90' 105 120135150 Blood pressure a. What is the mean of the distribution? Choose the correct answer below. OA. 95 B. 105 DC. 90 OD. 115 b. Estimate the percentage of students whose blood pressure is less than 90. Choose the correct answer below. 0 A. 4?% O B. 84% O C. 15% O D. 100% c. Estimate the percentage of students whose blood pressure is between 100 and 120. Choose the correct answer below. 0 A. 84% O B. 100% O C. 15% O D. 4?% d. Estimate the percentage of students whose blood pressure is greater than 120. Choose the correct answer below. 0 A. 4?% O B. 100% O C. 84% O D. 15%