Random variable X is normally distributed with mean 10 and standard deviation 3, and random variable Y is normally distributed with mean 9 and standard deviation 4.
If X and Y are independent, which of the following describes the distribution of Y - X?
a. Normal with mean 1 and standard deviation - 1
b. Normal with mean - 1 and standard deviation - 1
c. Normal with mean - 1 and standard deviation 5
d. Normal with mean - 1 and standard deviation 7
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