A mixture of pulverized fuel ash and Portland cement to be used for grouting should have a compressive strength of more than 1300 KN/m2. The mixture will not be used unless experimental evidence indicates conclusively that the strength specification has been met. Suppose compressive strength for specimens of this mixture is normally distributed with s 5 60. Let m denote the true average compressive strength. a. What are the appropriate null and alternative hypotheses? b. Let X denote