Answer:
d. The common ratio is 1.1
Step-by-step explanation:
To see if the data has a common ratio or common difference, we have to see if the division between them is equal(common ratio), or if the difference between them is equal(common difference).
In this case, since
, it has a common ratio.
To find it, we divide consecutive terms. For example:

So the correct answer is:
d. The common ratio is 1.1
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The answer is definitely B
The standard error of the mean is the standard deviation which is 6.50
In step 2 the 6(1 * x) is supposed to be 6 * 6x.