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 σ = 56. Let μ denote the true average compressive strength B)Let X denote the sample average compressive strength for n = 12 randomly selected specimens. Consider the test procedure with test statistic X and rejection region x ≥ 1331.26. mean of the test statistic KN/m2
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