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Mathematics, 24.06.2019 12:40 vale343

Hurry i need ! for a group experiment, your science class measured the fine- particulate concentrations in the air at random places around campus, and estimated a sample average of 12 (micrograms per cubic meter). if 196 readings were taken, and standard deviation of the sample measurements was 3.5 (micrograms per cubic meter), you are 99.7% confident that actual concentration of fine particulates at the school is

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