Find the unknown observations from the mean and variance, then the mean deviation

1. A.
   60
2. B.
   55
3. C.
   50
4. D.
   45

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1. A.
   $\frac{10}{3}$
2. B.
   $\frac{7}{3}$
3. C.
   3
4. D.
   $\frac{8}{3}$

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1. A.
   $\frac{13}{3}$
2. B.
   $\frac{16}{3}$
3. C.
   $\frac{11}{3}$
4. D.
   $\frac{14}{3}$

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

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1. A.
   5
2. B.
   4
3. C.
   6
4. D.
   7

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