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Compressive strength of concrete is known to be normally distributed with variance=1000 psi2. A random sample of 15 specimens has a mean strength of 3200

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Compressive strength of concrete is known to be normally distributed with variance=1000 psi"2. A random sample of 15 specimens has a mean strength of 3200 psi. Construct a 98% CI on the mean. 0 (2669.? : 3730.3) 0 (3181 : 3219) O |{3183.12 ; 3216.8) 0 (2599.3 ; 3800.?)

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