[" 86.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 number 2, 3, a and 11 is 3.5, then which of the following is true?

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

Standard deviation of 3, 5, 7 is

Standard deviation of 3, 4, 5 is