Suppose that daycare costs are normally distributed with a mean equal to $10,000 a year and a standard deviation equal to $2,000. What percentage of daycare centers will cost between $8,000 and $12,000?The length of an injected-molded plastic case that holds tape is normally distributed with a mean length of 85.9 millimeters and a standard deviation of 0.12 mm. What length must be exceeded in order for a particular case to be longer than 0.335*100% of all cases?The compressive strength of samples of cement can be modeled by a normal distribution with a mean of 5,634 kilograms per square centimeter and a standard deviation of 101 kilograms per square centimeter. What is the probability that a sample's strength is less than 6,171 kg/cm