An experiment was conducted to determine the effectiveness of a method designed to remove oil wastes found in soil.Three contaminated soil samples were treated.After 95 days,the percentage of contamination removed from each soil sample was measured with a mean of 49.3% and a standard deviation of 1.5%.If the percentage of contamination is normally distributed,the mean percentage of contamination removed at a 98% confidence level would be _____.
A)[48.36,50.24]
B)[43.27,55.33]
C)[47.29,51.31]
D)[47.88,50.72]
E)[46.47,52.13]

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The Answer of An experiment was conducted to determine the effectiveness of a method designed to remove oil wastes found in soil.Three contaminated soil samples were treated.After 95 days,the percentage of contamination removed from each soil sample was measured with a mean of 49.3% and a standard deviation of 1.5%.If the percentage of contamination is normally distributed,the mean percentage of contamination removed at a 98% confidence level would be _____.
A)[48.36,50.24]
B)[43.27,55.33]
C)[47.29,51.31]
D)[47.88,50.72]
E)[46.47,52.13]

An Experiment Was Conducted to Determine the Effectiveness of a Method