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This past week, the temperature has fluctuated quite a bit. From Monday to Sunday, temperatures in Fahrenheit have been the following: 62, 68, 52, 40, 78, 72, 60. The standard deviation is given as 13 and does not need to be calculated. Convert 40 into a z-score. How many standard deviations away from the mean is this?

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246806
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60
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246807
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180
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246812
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120
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