00:01
Hello, so today i'm going to answer your question about an application of a normal distribution with a loyalty program.
00:07
So first i ask you what would be the amount of people that would spend more than $70? for that i'm going to use this formula.
00:13
That is when you need to start first to find the critical value, then after the standardized you can find the percentage.
00:20
For the standardized you need to use this formula where you take the value, subtract the mean and divide by the standard deviation.
00:25
That's what i did here.
00:27
So your ceta value will be minus 1 .25.
00:29
And i use this table and go to the table.
00:33
This table told me that 10 .56 % of the population would spend less than $70.
00:39
I run the two decimal places as your success required.
00:43
Then the as you what is the probability that is between 70 and 103.
00:46
My approach would be that because already have what percentage is in this tail or below than 70, i just need to calculate this tail and because i know the old curve have one, i'm just going to subtract these two tails to one.
00:59
So, below 70, i already have it now above $103.
01:05
I replayed the same formula, subtract by the mean and standardize it.
01:09
Then find the ratio and look for this value on the table.
01:13
This tells me that this table is 0 .2090...