If the standard deviation of the numbers 2, 4, a and 10 is 3.5, then which of the following is true?

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

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

If the standard deviation of the numbers 2, 3, a and 11 is 3.5, then which of the following is true ? (1) 3a^2-26 a+55=0 (2) 3a^2-32 a+84=0 (3) 3a^2-34 a+91=0 (4) 3a^2-23 a+44=0

If the standard deviation of the numbers 2, 3, a and 11 is 3.5, then which of the following is true ? (1) 3a^2-26 a+55=0 (2) 3a^2-32 a+84=0 (3) 3a^2-34 a+91=0 (4) 3a^2-23 a+44=0

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

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

If standard deviation of the numbers 2,3,2x and 11 is 3.5, then the possible values of x are