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Statistics question

2020 · 2 Sep · Shift 1 · Q36
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Statistics question

2020 · 2 Sep · Shift 1 · Q36

JEE MainMathematicsStatisticsMCQ+4 / −1
Let X = {x ∈\in∈ N : 1 ≤\le≤ x ≤\le≤ 17} and Y = {ax + b: x ∈\in∈ X and a, b ∈\in∈ R, a > 0}. If mean and variance of elements of Y are 17 and 216 respectively then a + b is equal to :
  1. A
    7
  2. B
    9
  3. C
    -7
  4. D
    -27
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