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100 students obtained an average score of 75 points. The variance is 2500 wWWWWWw Wwwwwwww wwww WWWW Wwwwwwwwwwww ww points. Find a 98% confidence interval

100 students obtained an average score of 75 points. The variance is 2500 wWWWWWw Wwwwwwww wwww WWWW Wwwwwwwwwwww ww points. Find a 98% confidence interval for a (75.54 : 79.46) b) (63.35 : 86.65) c) (323.04 : 326.96) d) (-170.00 ; 300.00)

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