I have no idea where to start?

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?

There is not enough information

If A is "Cd player"
B is "having telephone"
C is "having computer", we have to use the formula

Number(A or B or C)= Number(A) + Number(B) + Number(C) - Number(A and B) - Number(A and C) - Number(B and C) + Number (A and B and C)

What you are asking for is Number (A and B and C)

Can you see which data is missing?
Also do we know of the 1000 people if there are some that don't have either phone, computer or CD??

answer is 2 btw

To answer this question, we need to find the minimum number of people who have all three objects: a CD player, a telephone, and a computer.

To start, we can calculate the minimum number of people who have a CD player, a telephone, and a computer individually.

From the survey, we know that 70% of people have a CD player, 85% have a telephone, and 45.2% have a computer.

To find the minimum number of people who have all three objects, we need to find the smallest percentage out of the three given percentages.

In this case, the smallest percentage is 45.2% (the percentage of people who have a computer).

To find the minimum number of people who have all three objects, we multiply 45.2% by 1000 (the total number of people surveyed):

45.2% * 1000 = 452

Therefore, at least 452 people have all three objects (a CD player, a telephone, and a computer).