Combined mean of groups of given sizes and means

1. A.
   144.32 cm
2. B.
   145.52 cm
3. C.
   146.72 cm
4. D.
   147.92 cm

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1. A.
   276
2. B.
   282
3. C.
   285
4. D.
   375

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1. A.
   $2m - \frac{m^2}{n}$
2. B.
   $2m + \frac{m^2}{n}$
3. C.
   $m - \frac{m^2}{n}$
4. D.
   $m + \frac{m^2}{n}$

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1. A.
   9
2. B.
   8.5
3. C.
   6.5
4. D.
   5.5

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