Posted by **Matt** on Thursday, October 25, 2007 at 8:46pm.

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?

Is the answer 258, because that's what I keep getting?

- Calculus Check -
**drwls**, Friday, October 26, 2007 at 12:01am
452 have a computer. That number could include at most 150 with no telephone, but probably fewer. So at least 302 have both computer and phone. The 300 with no CD player could be among that 302, but there are probably fewer. So at least 2 have all three. The most likely number having all three, if the distributions are uncorrelated, is 1000 x 0.452 x 0.7 x 0.85 = 269, but that is not what they ask for.

## Answer This Question

## Related Questions

- Calculus Check - A survey of one thousand people found that 70% of the people ...
- Cacluluc CHECK - A survey of one thousand people found that 70% of the people ...
- Calculus Help? - I have no idea where to start? A survey of one thousand people ...
- Calculus - A survey of one thousand people found that 70% of the people have a ...
- math - In a survey, 12% of people have no pets, 44% of the people have 1 pet, 16...
- Statistics - Some IQ scores are standardized with a mean of 100 and a standard ...
- Math_Statistics - Some IQ scores are standardized with a mean of 100 and a ...
- Math Urgent - In a survey of 63 people, 23 people subscribe to magazine A, ...
- MATH - URGENT!!! - 6 people are sitting around a table. Let x be the number of ...
- Survey Math (Ok, THIS Is That Last ONE! Hopefully) - In a survey, one out of ...

More Related Questions