52K-Fall 2021-Finite Math Eth = Test: Final Exam Question 28 This Test: 30 pts possible Subm InteIval riequency The lives (in hours of continuous use) of 100 randomly selected 6.95 -7 45 CON flashlight batteries are 7 45 -7 95 7.95 - 8 45 19 8 45 - 8 95 8 95 - 9 45 9.45 - 9.95 9.95 - 10 45 a. Find the mean of the battery lives. hrs (Type an integer or a decimal Round to two decimal places,) b. Find the standard deviation of the battery lives hrs (Type an integer or a decimal Round to two decimal places.) Ne