A stock market analyst compiled the daily rates of return for a stock. The analyst wanted to estimate the mean rate of return and sampled rates from different 120 days. Suppose the sample mean (X) was 8.3 and the sum of squared deviations (∑(Xᵢ - X)²) was 134.2. The analyst wants to build an interval estimate for the mean rate of return so that the interval brackets the true population mean with a probability 0.99. What is the lowest number in that interval? Answer correct to 2 decimal places.