systolic blood pressures are assumed to follow a normal distribution with mean of 108 and varience of 196.if an individual is selected at random from...

systolic blood pressures are assumed to follow a normal distribution with mean of 108 and varience of 196.if an individual is selected at random from a population find: the probability that his systolic blood pressure is below 100,probability that the blood pressure is between 100 and 108,the modal systolic blood pressure,the 90th percentile in the systolic blood pressure.