Question: Need help with this problem The life of a certain type of engine is normally distributed with a mean of 10 years, and a standard

Need help with this problem

The life of a certain type of engine is normally distributed with a mean of 10 years, and a standard deviation of 1.5 years. (1) If one engine is randomly selected, what is the probability that the life of this engine is between 8 and 13 years? 3. Find the zscore, and construct the standard normal distribution density curve, then shade your seeking area. b. Find the probability. (2) If 20 engines are randomly selected, what is the probability that the mean life of these 20 engines is between 3 and 13 years? a. Find the z-score, and construct the standard normal distribution density curve, then shade your seeking area. b. Find the probability

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