In a group of 100 children, the mean weight of children is 15 kg. The standard deviation is 1.5 kg. Which one of the following is true?
95% of all children weight between 12 and 18 kg 95% of all children weight between 13.5- and 16.5kg 99% of all children weight between 12 and 18 kg 99% of all children weight between 13.5 and 16.5kg