Two independent random samples have been selected, 100 observations from population 1 and 100 from population 2. Sample means for population 1 is 79 and for population 2 is 48. From previous experience with these populations, it is known that the variances are 11 and 9 for population 1 and 2 respectively. If you want to compare the population means for these samples, what is the lower bound using the significance level as 95%. Round your final answer to two decimal places as needed.