JEE Math Practice Question
If the mean and the standard deviation of the data 3, 5, 7, a, b are 5 and 2 respectively, then a and b are the roots of the equation :
- A.x2 – 20x + 18 = 0
- B.2x2 – 20x + 19 = 0
- C.x2 – 10x + 18 = 0
- D.x2 – 10x + 19 = 0
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