An SRS of 100 is taken from a Normal distribution with a mean of 25 and a standard deviation of 4 , and an SRS of 85 is taken from a different Normal distribution with a mean of 40 and a standard deviation of 7. Which of the following expressions represents the standard deviation of the sampling distribution of the difference of means from these two samples?
a.
b.
c.
d.
e.
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