Mathematics, 01.04.2020 01:15 elianagilbert3p3hh63

The concentration of carbon monoxide (CO) in a gas sample is measured by a spectrophotometer and found to be 85 ppm. Through long experience with this instrument, it is believed that its measurements are unbiased and normally distributed, with an uncertainty (standard deviation) of 7 ppm. Find a 95% confidence interval for the concentration of CO in this sample. Round the answers to two decimal places.

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