SITUATION 1 Consider the following results of compression test for twelve 28-day concrete cylinder samples from a partic
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SITUATION 1 Consider the following results of compression test for twelve 28-day concrete cylinder samples from a particular mix batch during construction. (Note: The data are expressed in psi. The minimum required 28-day compressive strength of concrete for the particular construction project is 3000 psi). 3031 3112 2994 3063 3002 2965 3218 2895 2954 2780 2940 3015 (a) Determine the mean and median of the given data. (b) Determine the range, standard deviation, and coefficient of variation of the given data.
(c) According to ACI 318 standard, the concrete samples are adequately cured for testing if the average strength of the samples is at least 85% of the target compressive strength. Does the given result satisfy this requirement? (d) According to ASTM C39 standard, the coefficient of variation of a given compression test result for concrete testing must not exceed 3.2% for it to be acceptable. Does the given result satisfy this requirement?