The "cold start ignition time" of an automobile engine is being investigated by a gasoline manufacturer. The following times (seconds) obtained for a test vehicle. were 1.60, 1.93, 2.66, 2.31, 3.05, 3.22, 2.54, 1.91 (a) Calculate the sample mean, sample variance, and sample standard deviation. Round your answers to 4 significant digits. Mean = seconds Variance = i seconds² Standard Deviation = i seconds

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