Standard Deviation with Unknown (Jee Mains) | ExamDuo
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Dispersion and Variance
Hard
Standard Deviation with Unknown
If the standard deviation of the numbers 2,3, a and 11 is 3.5, then which of the following is true?
SELECT ONE OPTION
A
3a² – 23a + 44 = 0
B
3a² – 26a + 55 = 0
C
3a² – 32a + 84 = 0
D
3a² – 34a + 91 = 0
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