00:01
This problem says consider the frequency distribution table below, and we're told the table shows the distribution of the ages of actresses when they win a best actress oscar.
00:09
And use the frequency table to approximate the mean age of the best actress winner, rounding to one decimal place.
00:16
And to find this approximate mean, what we're going to do is find the midpoint of each age range, or the class limits that we're looking at as far as the age limits, and then find that midpoint and multiply by each age range's frequency.
00:35
And then once we multiply and find all those values, we'll sum those values and then divide by the total frequency.
00:40
So for the midpoint of age 20 to 29, that would be 24 .5.
00:45
27 times 24 .5 gives us 661 .5.
00:50
The midpoint of 30 to 39 would be 34 .5.
00:54
And 34 times 34 .5 gives us 1173.
00:59
The midpoint for 40 to 49 would be 44 .5.
01:02
Multiplying that by the frequency of 13 gives us the result of 578 .5...