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# Standard Deviation with a Missing Entry

GRE-KKEAFE

Consider the data set below:

$$2, 2, 4, 3, 7, 9, X$$

The mean of the data set above is 5. What is the standard deviation of the data set rounded to 2 decimal places?

A

$5.92$

B

$2.73$

C

$8.00$

D

$52.00$