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
Let Xdenote the sample average compressive strength for
n = 10 randomly selected specimens. Consider...