The compressive strength of samples of cement can be modeled by a normal distribution with a mean of 6000 kilograms per square centimeter and a standard deviation of 100 kilograms per square centimeter. a. What is the probability that a sample’s strength is less than 6250 Kg/cm²? b. What is the probability that a sample’s strength is between 5800 and 5900 Kg/cm²? c. What strength is exceeded by 95% of the samples?