Final answer:
To find the baby's mass in kilograms, we need to convert pounds and ounces to kilograms. 29 lbs 4 oz is approximately equal to 13.28 kg.
Step-by-step explanation:
The heaviest baby ever born weighed 29 lbs. 4 oz. To find the baby's mass in kilograms, we need to convert pounds and ounces to kilograms. 1 pound is approximately equal to 0.4536 kilograms, and 1 ounce is approximately equal to 0.0283 kilograms. To convert pounds to kilograms, we multiply the number of pounds by 0.4536. To convert ounces to kilograms, we multiply the number of ounces by 0.0283. Therefore, the baby's mass in kilograms will be:
29 lbs * 0.4536 kg/lb + 4 oz * 0.0283 kg/oz = 13.1404 kg + 0.1132 kg = 13.2536 kg
Therefore, the correct answer is option a) 13.28 kg.