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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 o = 69. Let u denote the true average compressive strength. (a) What are the appropriate null and alternative hypotheses? O Ho: M = 1,300 Ha: M > 1,300 Ho: M = 1,300 Ha: H # 1,300 Ho: M = 1,300 Ha: M 1,300 Ha: M = 1,300 Ho: M