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The Department of Environmental Protection measured the volume of water in 10 similarly sized reservoirs in State X and found that the standard deviation of their volumes at the start of the year was 4 million cubic gallons. Was the standard deviation of those 10 volume measurements lower at the end of the year?
(1) At the end of the year, the average volume of the water in the 10 reservoirs had decreased by 20%.
(2) The percent decrease in the volume of the water in each reservoir during the year was the same.
OA B
Source: Veritas Prep
(1) At the end of the year, the average volume of the water in the 10 reservoirs had decreased by 20%.
(2) The percent decrease in the volume of the water in each reservoir during the year was the same.
OA B
Source: Veritas Prep
