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A neuroscientist measures the reaction times (in seconds) during an experimental session in a sample of cocaine-addicted ( n = 8),morphine-addicted ( n = 6),

A neuroscientist measures the reaction times (in seconds) during an experimental session in a sample of cocaine-addicted (n = 8),morphine-addicted (n = 6),

and heroin-addicted rats (n = 12). Mean reaction times in each sample were 17, 13, and 12 seconds, respectively. What is the weighted mean for all three samples? Hint: The overall mean is not 14.0 seconds. (Round your answer to two decimal places.)

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