At a school's open house, T-shirts and sweatshirts were
sold.
Each item was purchased by either a student or a parent.
The two-way frequency table summarizes a random sample of
80
items sold that night.
Student | Parent | |
---|---|---|
T-shirt |
24 |
19 |
Sweatshirt |
16 |
21 |
Let sweatshirt be the event that an item randomly chosen from among those sold was a sweatshirt.
Let student be the event that an item randomly chosen from among those sold was purchased by a student.
Find the following probabilities. Write your answers as decimals.
|
||||||
Student | Parent | Total | |
T-shirt | 24 | 19 | 43 |
Sweatshirt | 16 | 21 | 37 |
Total | 40 | 40 | 80 |
a.
b.
c.
At a school's open house, T-shirts and sweatshirts were sold. Each item was purchased by either...