The standard error of the mean is 128.125.
The formula for standard error is:

With our information, we have:
22 x 85 = (20+2)*85= 20*85+ 2*85 = 1700 + 170 = 1870
Answer:
8.6
Step-by-step explanation:
The square root of 74 is 8.602325, which rounded to the nearest tenth, is 8.6
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You’ll have to adjust the plotting a bit to fit your graph that you have, but this is the main idea.