00:01
In this question, we're given data of the smokers and non -smokers versus the different age group here.
00:08
So let's do the roll total.
00:11
For row total, for the age group of 1829, i'll be taking 174 plus 618 and that will be 792.
00:20
Next row is 1448.
00:24
Next row is 1829.
00:27
Next row is 1918.
00:31
So if you total up this, you'll go.
00:33
The grand total of 5987.
00:37
So there are a total of 5987 people survey.
00:42
Now let's look at our column total.
00:48
So column total for smokers here will be adding up the column is 112.
00:54
For non -smokers over here it will be 4885.
01:01
I like the event as be a smoker.
01:04
Event a is an adult age 65 order.
01:07
Now, in part a, we want to find that the selected adult is a smoker.
01:13
So that is probability of the event s.
01:17
So smokers are this.
01:18
Total is 112 out of 5987.
01:23
So that would be 0 .1841 for decimal place.
01:30
In part b, selected adult is under 50 years.
01:35
Now, under 50 years, adults, you will be looking at this 2h group here.
01:41
So we're looking at the total here.
01:43
So that will be 792 plus 1448 out of the total number of 5987...