ANSWER THE MANUFACTURER OF TELEVISION TUBES KNOWS FROM THE PAST EXPERIENCE THAT THE AVERAGE LIFE OF TUBE IS 2000 HRS WITH A S.D OF 200 HRS A SAMPLE OF 100 TUBES HAS AN AVERAGE LIFE OF 1950 HRS TEST AT THE 0.01 LEVEL OF SIGNIFICANCE TO SEE IF THIS SAMPLE CAME FROM A NORMAL POPULATION OF MEAN 2000 HRS
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4 tress teabags tyres units
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