00:01
A store manager gathered some data about their customers, and this was what they found.
00:06
And in part a, we want to determine the probability that a randomly selected customer is at least 20, but no more than 49 years old.
00:20
So you need to think in terms of probability as favorable over possible.
00:26
So these would be the favorable customers, because they all.
00:31
Fall in that age category over a possible would be when we add up the number of customers.
00:39
And when we add up the number of customers, we get 462.
00:43
So when we add up the three favorable numbers and put them over the possible numbers, we get 228 over 462.
00:58
As a decimal, that would be 0 .49352.
01:09
06, 4935, and your directions were very specific to round to four decimal places.
01:17
For part b, we are trying to determine what's the probability that the randomly selected person was older than 50 or was less than 20.
01:31
So for this one, we're going to find the probability of being greater than 50...