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The room temperature in PS135 is normally distributed with mean 48 degrees and variance 16 degrees. What is the z- score for an observed temperature

The room temperature in PS135 is normally distributed with mean 48 degrees and variance 16 degrees. What is the z- score for an observed temperature of 50 degrees? Select one: O a. 0.5 O b. -0.5 O c. 0.25 O d. 0

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