Question 2 a) The mean percentage of aggregate in a series of 850 test samples of concrete was found to be 65.5% with a

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Question 2 A The Mean Percentage Of Aggregate In A Series Of 850 Test Samples Of Concrete Was Found To Be 65 5 With A 1 (21.32 KiB) Viewed 95 times

Question 2 a) The mean percentage of aggregate in a series of 850 test samples of concrete was found to be 65.5% with a standard deviation of 1.2%. Assuming the distribution is normal find: i. How many of the test samples have an aggregate content of below 63.8% (5) ii. How many of the test samples have an aggregate content of greater than 66.3% (5) iii. How many of the test samples have an aggregate content of between 65% and 66.8% (5) iv. How many of the test samples have an aggregate content of less than 64.3% or more than 67%