Measurements from an Atwood's Machine

I made measurements with a simple Atwood's Machine. The mass on the left-hand side fell by d = 98 cm each time.



   Left-hand mass    Right-hand mass               time 
       M1 (g)             M2 (g)                    (s)
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       207                200              4.06   4.03   3.88

       206.5              200.5            4.53   4.59   4.62

       206                201              5.00   5.00   5.06
 
       205.5              201.5            6.13   6.16   6.19

       205                202              8.00   7.75   7.87

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Your job: use this data to make a table, and then a graph. The table should look like this:


                                     M1-M2
  Mass difference     Total mass     -----      time        acceleration
    M1-M2              M1+M2         M1+M2      (s)            (cm/s^2)
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We'll split up the task of computing these values, and then write the values up on the board for everyone to copy.

The graph should show

acceleration on the vertical axis (cm/s^2)
mass ratio (M1-M2) / (M1+M2) on the horizontal axis

Determine slope of the straight line on this diagram, and its uncertainty.