00:01
In a recent survey of 645 working americans aged 25 to 34, the average weekly amount spent on lunch was $43 .51.
00:12
I'm going to write that down.
00:15
With a standard deviation of $2 .98, the weekly amounts are approximately bell -shaped.
00:23
So we have bell -shaped, which means we can treat this like a normal distribution.
00:31
So estimate the percentage of the amounts that were less than $40 .53.
00:36
So we're finding the amount less than 40 .53.
00:42
So drawing our curve here, we're centered at 4351.
00:47
We have our center deviation of $2 .98.
00:50
I'm just going to draw one standard deviation on each side.
00:58
So 46, 49, and then 4053.
01:11
And 4053 is actually the value that we're trying to find the percentage that we're we're less than it...