A random variable is normally distributed with a mean of 20 and a standard deviation of 4. If an observation is randomly selected from the distribution, a. What value will be exceeded 15% of the time? b. What value will be exceeded 75% of the time? c. Determine two values of which the smaller has 20% of the values below it and the larger has 20% of the values above it. d. What value will 25% of the observations be below?
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