A survey of one thousand people found that 70% of the people have a

CD player, 85% have a telephone, and 45.2% have a computer. At
least how many people have all three objects?

To find out the minimum number of people who have all three objects, we can use the concept of sets and intersections.

Let's start by representing the three objects as sets:
- CD player set: 70% of 1000 = 700 people
- Telephone set: 85% of 1000 = 850 people
- Computer set: 45.2% of 1000 = 452 people

Now, to find the minimum number of people who have all three objects, we need to find the intersection of these three sets:

CD player ∩ Telephone ∩ Computer

To calculate the intersection, we can take the minimum value from each set:

Intersection = min(700, 850, 452)

Therefore, the minimum number of people who have all three objects is:

Intersection = min(700, 850, 452) = 452

Hence, at least 452 people have all three objects.