A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is more than 750 hours.
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Extracted Content from Question Files:
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2.33
-2.33
2.60
2.95
1.96
1.33
2.57
1.74
2.82
2.86
2.33
2.54
2.997
1.667
1.291
none of the preceding
