Final answer:
To convert 91 lbs 11 oz to kilograms, ounces are converted to pounds and then the total weight in pounds is multiplied by the conversion factor of 0.453592 kg/lb. After rounding to the tenths place, the patient's weight is determined to be 41.7 kg.
Step-by-step explanation:
To convert the patient's weight from pounds and ounces to kilograms, first we need to understand the conversion factors: 1 pound equals 0.453592 kilograms, and there are 16 ounces in a pound. The patient weighs 91 lbs 11 oz, which we can convert by first transforming the ounces to pounds: 11 oz is 11/16 lbs. Adding this to 91 lbs gives us the total weight in pounds.
Next, we convert this total weight into kilograms by multiplying the weight in pounds by the conversion factor (0.453592 kg/lb). The least precise measurement in our calculation is to the tenth of a kilogram, so our final answer should also reflect this level of precision. After calculations and rounding to the tenths place, we find that the patient weighs 41.7 kg.