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# If the standard deviation of the numbers 2,

Question:

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

1. $3 a^{2}-23 a+44=0$

2. $3 a^{2}-26 a+55=0$

3. $3 a^{2}-32 a+84=0$

4. $3 a^{2}-34 a+91=0$

Correct Option: , 3

Solution: