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A radio station claims that the amount of advertising per hour of broadcast time has...

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Basic Math

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A radio station claims that the amount of advertising per hour of broadcast time has an average of 12 minutes and a standard deviation equal to 1.2 minutes. You listen to the radio station for 1 hour, at a randomly selected time, and carefully observe that the amount of advertising time is equal to 15 minutes. Calculate the z-score for this amount of advertising time. z = 1.15z = -2.50Z=-1.15z = 2.50

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