The number of fires set by candles in a home is normally distributed. The data is for 7 randomly selected years. Establish a 99% confidence interval for the mean. 5460 5900 6090 6310 7160 8440 9930 What is the lower bound of the interval, rounded to the nearest whole number? What is the upper bound of the interval, rounded to the nearest whole number? Why is a T interval appropriate? OA. The value of the population standard deviation is not known. OB. The value of the population standard deviation can be found with the TI. OC. The population is normally distributed. OD. Both A and C.