The following data represent the levels of sulfate residuals obtained from photosynthesis of carbon-based substrate, measured in grams. A random sample of 15 substrates, taken from Fiji Islands, yielded an average residual of 811.4 with a standard deviation of 207.09.

From previous studies, it is known that the population has approximately normal distribution. Construct and interpret 95% confidence interval for the mean sulfate residuals of all substrates on Fiji Islands. Round to the nearest hundredth.