A farmer investigated pesticide contamination at a small pond with significant run-off (meaning water runs from the nearby fields into the pond). Ten measurements of pesticide concentrations were randomly taken at the pond (assume the pesticide is normally distributed throughout the pond). The reported pesticide concentrations: 18.4, 25.8, 27.3, 19.5, 23.8, 29.4, 30.1, 29.1, 33.8 and 35.7 g/L. Given that the data distribution is normal, calculate a 95% confidence interval for the mean amount of pesticide contained in the pond.

a	We are 95% confident that the true mean of pesticide contamination in the pond is between 27.29 and 31.3 g/L
b	We are 95% confident that the true mean of pesticide contamination in the pond is between 23.28 and 27.29 g/L
c	We are 95% confident that the true mean of pesticide contamination in the pond is between 23.485 and 31.094 g/L
d	We are 95% confident that the true mean of pesticide contamination in the pond is between 23.28 and 31.3 g/L
e	None of the above is correct