Homework Help: Calculus Help?

Posted by Matt on Tuesday, October 23, 2007 at 5:30pm.

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?

Calculus Help? - Reiny, Tuesday, October 23, 2007 at 5:40pm
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??

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