Find the missing observations from the given mean and variance

1. A.
   $4\sqrt{3}$
2. B.
   $3\sqrt{3}$
3. C.
   $2\sqrt{3}$
4. D.
   $5\sqrt{3}$

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1. A.
   1
2. B.
   2
3. C.
   3
4. D.
   4

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1. A.
   $a=3, b=4$
2. B.
   $a=0, b=7$
3. C.
   $a=5, b=2$
4. D.
   $a=1, b=6$

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1. A.
   $45$
2. B.
   $44$
3. C.
   $48$
4. D.
   $40$

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1. A.
   $x^2 - 10x + 18 = 0$
2. B.
   $2x^2 - 20x + 19 = 0$
3. C.
   $x^2 - 10x + 19 = 0$
4. D.
   $x^2 - 20x + 18 = 0$

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