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Assume that X is normally distributed with a mean of 8 and a standard deviation of 3. Determine the value of x that solves each

Assume that X is normally distributed with a mean of 8 and a standard deviation of 3. Determine the value of x that solves each of the following:

a: P(-x < X-10 < x) = 0.90

b: P(-x < X-10 < x) = 0.98

I have seen countless answers. Please explain thoroughly because when I solve for x and plug it back in, it never adds up.

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