Posted by Jen on Sunday, July 10, 2011 at 11:59pm.
An electronics store surveyed every 8th customer who came into the store for a week.
Of the 380 people who responded,
185 people watched movies on VHS tapes.
251 people watched movies on DVDs.
72 people watched movies both on VHS tapes and DVDs.
i. Of those surveyed, how many watched only VHS tapes?
ii. Of those surveyed, how many watched only DVDs?
iii. Of those surveyed, how many watched VHS tapes or DVDs, but not both?
iv. Of those surveyed, how many watched VHS tapes or DVDs, or both?
(I'm not sure how if this is a trick question or what, please help...)
- Math-Can u help me Reiny? - Reiny, Monday, July 11, 2011 at 12:09am
make a Venn diagram of two intersecting circles, call one V for VHS, the other D for DVD
put 72 in the intersection of the two circles
Now 185 will go into circle V, but you already have 72 of those in the intersection , so put 113 in V outside the intersection.
You have 251 to go into circle D, but D alreasdy contains 72 of those, so that leaves 179 for the open part of D
Add them up: 113+72+179 = 364
but 380 were surveyed, which means that 16 must not watch either VHS or DVD
put a rectangle around the two circles and place 16 inside the rectangle but outside the circles.
You should be able to answer any of your questions from the diagram.
- Math-Can u help me Reiny? - Jen, Monday, July 11, 2011 at 12:16am
GREAT!!! I understand it now....its weird though because I got the same answer 364, but I just added 185+251=436-72=364 and then subtracted 364 from 380 and got 16 remaining....haha THANKS SO MUCH!!
- Math-Can u help me Reiny? - Jen, Monday, July 11, 2011 at 12:20am
Okay so my final answers are:
iii. 292 (add 113+179)
iv. ?? i think its 72 ??
Answer This Question
More Related Questions
- Geometry - I want to check this problem also; An elctronics store surveyed every...
- math - Elisa surveyed people in her neighborhood about whether they would like ...
- stastics - johns runs a computer software store.he counted 128 people who walkrd...
- math - for a store contest 4 out of every 65 people who visit the store will ...
- Statistics - John runs a computer software store. Yesterday he counted 127 ...
- Math-Can u help me Reiny? So confused :( - A car dealership interviewed every ...
- algebra - A group of 1,200 people was surveyed to find their favorite choice of ...
- math - A manager samples the receipts of every fifth person who goes through the...
- math, HELP ME PLEASE!! - T determine what people like to do in their leisure ...
- Math - A survey found that 12 out of 15 people prefer hamburgers over pizza. If ...