If the standard deviation of the numbers 2, 3, a and 11 is 3.5, then which of the following is true?

Question

3$a$² - 26$a$ + 55 = 0

3$a$² - 32$a$ + 84 = 0

3$a$² - 34$a$ + 91 = 0

3$a$² - 23$a$ + 44 = 0

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