In constructing a confidence interval for or 2, a table is used to find the critical values 2L and 2R for values of n101. For larger values of n, 2L and 2R can be approximated by using the formula 2=12z/2+

2k12, where k is the number of degrees of freedom and z/2 is the critical z-score. Construct the90% confidence interval for using data for which a sample of size n=232 yields a mean weight of 154 lb and a standard deviation of 25.5 lb. Round the confidence interval limits to the nearest hundredth.