Assume that X has a Normal distribution with a mean of 2 and a standard deviation of

Question:

Assume that X has a Normal with a mean of 2 and a standard deviation of 3. Use the standard Normal table to find the following cut-off values for X. Also sketch a standard Normal curve, and shade the region corresponding to the given probability.
a. P (X < x) = 0.78
b. P (X > x) = 0.21
c. What are the two central values such that 90% of the X values are in the range between these two numbers? Distribution
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