Question

a manufactorer tests batteries by using them to continuously operate a mechanical bunny.
Complete the table below -
batt life X no of batt f f times x cum. freq. c.f
5 3
6 5
7 6
8 12
9 9
10 7
11 5
12 3
what is the mode and median battery life?
calculate the mean battery life in hours correct to 1 decimal place?

Answer 1

mode is which number occurs the most time
median is which number is in the middle- this can either be solved by writing down all the numbers and looking at which number is in the center, or determining how many tests were done, dividing it by 2 and then counting to that number

ex.
5 3 means
5,5,5

mean, means the average,
total battery life divided by total batteries

example
(5*3+6*5+7*6+.......) /( 3+5+6+.....)