Help with parts a,b,c,d Show work

The nicotine content in a single cigarette of a particular brand has a normal distribution with mean 0.8 mg and a standard deviation of 0.1 mg. a. Calculate the probability that a cigarette has more than 0.9 mg of nicotine. b. What is the probability that a cigarette has between 0.75 mg and 0.9 mg of nicotine? C. What amount of nicotine corresponds to the 80th percentile? d. What amount of nicotine corresponds to the 95th percentile