Please show all steps, I am not sure where i'm messing up

In a study of children with a particular disorder, parents were asked to rate their child on a variety of items related to how well their child performs different tasks. One item was "Has difficulty organizing work," rated on a five-point scale of 0 to 4 with 0 corresponding to "not at all" and 4 corresponding to "very much." The mean rating for 273 boys with the disorder was reported as 2.35 with a standard deviation of 1.11. (Round your answers to four decimal places.) Compute the 90% confidence interval. (2.2405 X , 3.4484 X ) Compute the 95% confidence interval. 2.481 x ) Compute the 99% confidence interval