The formula to calculate the infusion rate for inj dobutamine is
doctors advice in microgram x body weight in kg x 60 minutes
concentration
Here the doctors advice is 3mcg/kg/minute
Patient body weight is 140.8 lbs,to convert pounds to kilogram multiply with 0.453
so the weight in kg is 140.8 x 0.453 = 63.865 kg
To find the concentration,the dilution given is 250 mg of dobutamine in 250ml of D5W
The formula to find the concentration is mass / volume =250mg /250ml = 1mg/ml
to convert mg to mcg multiply with 1000 so the concentration is 1000mcg/ml
Now we can put all these values in the formula to find the rate
(3mcg x 63.865 x 60) / 1000 mcg = 11.48ml/hr
So the pump setting should be at 11.480 ml / hr
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