Researchers at the university of pennsylvania school of medicine have determined that children under 2 years old who sleep with the lights on have a 31% chance of becoming myopic before they are 16. children who sleep in darkness have a 27% probability of becoming myopic. a survey indicates that 26% of children under 2 sleep with some light on. find the probability that a random child under 2 will become myopic before reaching 16 years old.