Suppose the growth rate of a population is normal distribution with mean 50 and standard deviation 20. That is X~N(50,202) (1) Compute the probability of growth being larger than 70. (2) Compute the probability of growth being smaller than 40 (3) What is the rate of growth such that it touches the top 10% of growth level? (4) Find the range such that the growth is in the middle of 80% of growth level. please explain fully each step

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