The time to complete an exam is approximately Normal with a mean of 55 minutes and a standard deviation of 4 minutes. The bell curve below represents the distribution for testing times. The scale on the horizontal axis is equal to the standard deviation. Fill in the indicated boxes. 55 ở = 4 H-30 µ-20 µ-o uto H+ 20 µ+30 μέσ u+ 20 u+ 3ơ

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