A manufacturer knows that their items have a normally distributed lifespan, with a mean of 9.8 years, and standard deviation of 2.3 years. If you randomly purchase one item, what is the probability it will last longer than 8 years? Round answer to three decimal places [:1 The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.954 grams and a standard deviation of 0.281 grams. Find the probability of randomly selecting a cigarette with 0.589 grams of nicotine or less. Round your answer to four decimals. P(X