I am getting this one wrong. Im not sure what im doing that is incorrect. Please help with steps, thank you.

You measure 35 turtles' weights, and find they have a mean weight of 31 ounces. Assume the population standard deviation is 2.7 ounces. Based on this, what is the maximal margin of error associated with a 99% confidence interval for the true population mean turtle weight. in your calculations: --Use z = 1.645 for a 90% confidence interval --Use z = 2 for a 95% confidence interval --Use z = 2.576 for a 99% confidence interval. Give your answer as a decimal, to two places m = ounces