A mixture of pulverized fuel ash and Portland cement to be used for grouting should have a compressive strength of more than 1,300 KN/m. 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 = 69. Let u denote the true average compressive strength. (a) What are the appropriate null and alternative hypotheses? O Ho: 1,300 Hu 1,300 Ho: 1,300 H: > 1,300 OH = 1,300 H