if the total cholestrol for a certain population are approximately normally distributed with a mean of 200 mg/100ml and a standard ceviation of 200mg/100ml,find the probality that an individual picked at random from this population will have a cholestrl value:

a between 180 and 200mg/100ml

b greater than 225mg/100ml

c less than 150mg/100ml

d between 190 and 210mg/100ml