Assuming the normal heart rate (H.R) in normal healthy individuals is normally distributed with Mean = 70 and Standard Deviation =10 beats/min. a) What is the probability that the heart rate is above 80 beats/min? b) What is the probability that the heart rate is above 90 beats/min? c) What is the probability that the heart rate is between 50-90 beats/min? d) What is the probability that the heart rate is above 100 beats/min