I have this problem for homework:

I'm not sure what it's asking. Does it want me to find the largest area covered by the bulb's life and base the best life span on that or does it want me to base it on how much area is left?Light bulbs are measured in lumens (light output), watts (energy used), and hours (life). A standard white light bulb has a mean life of 675 hours and a standard deviation of 50 hours. A soft white light bulb has a mean life of 700 hours and a standard deviation of 35 hours. At a local science competition, both light bulbs lasted 750 hours. Which light bulb’s life span was better? Explain.

PS This worksheet is on the bell-shaped curve, the mean and standard deviation.