The probability density function of the time it takes a hematology cell counter to complete a test on a blood sample is f(x) -0.04 for 46 < x < 71 seconds. Round your answers to 2 decimal places. (a) What proportion of tests require more than 70 seconds to complete? (b) What proportion of tests require less than one minute to complete? (c) Determine the mean and variance of the time to complete a test on a sample. Mean seconds Variance i seconds²

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