The lives (in hours of continuous use) of 100randomly selected flashlight batteries are:Interval6.95-7.457.45-7.957.95 8.458.45-8.958.95-9.459.45-9.959.95-10.45hrsa. Find the mean of the battery lives.(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.)FrequencyNETHER28213419133

The formula of mid value is, Calculation of mid value:

The lives (in hours of continuous use) of 100 randomly selected flashlight batteries are: Interval 6.95-7.45 7.45-7.95 7.95-8.45 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.) . Find the standard deviation of the battery lives. hrs Type an integer or a decimal. Round to two decimal places.) Frequency NOTHER3 21 34 19 13