Problem: The weights of 1,000 children average 50 kg. and the standard deviation is 5 kg. How many children weigh between 40 kg. to 55 kg.? STEPS SOLUTION 1. What z-score corresponds to X=40 kg.? .2-score = 2. What z-score corresponds to X-55 kg.? z-score = Sketch the graph of the distribution 3. Place the corresponding z-scores in your graph. 4. Find the total area between the z-values that correspond to 40 and 55. 5. Multiply the total area by 1,000 ( the total number of children). Round up to the nearest whole number. 6. Write your conclusion