# Probability Word Problem homework help

• Nov 20th 2012, 02:54 AM
asilvester635
Probability Word Problem homework help
A group of students was recently polled about the technology they own.

69 own a cell phone
45 own a computer
23 own an ipod
4 do not own any of the above three items
34 own a cell phone but not a computer nor an ipod
6 own all three, a computer, an iPod, and a cell phone
8 own a cell phone and an ipod but not a computer
2 own only an ipod

a.) How many students were polled?

b.) What is the probability a randomly selected polled student owns a computer?

c.) What is the probability a computer owner also owns an iPod?

d.) What is the probability a randomly selected polled student owns an iPod or a cell phone?

e.) What is the probability a randomly selected polled student owns an ipod and a cell phone?
• Nov 20th 2012, 02:57 AM
MarkFL
Re: Probability Word Problem homework help
A Venn diagram will be very helpful to solve this. Have you tried drawing one?
• Nov 20th 2012, 03:05 AM
asilvester635
Re: Probability Word Problem homework help
I'll try
• Nov 20th 2012, 03:18 AM
MarkFL
Re: Probability Word Problem homework help
Once you do, post your answer to part a) and I will tell you if it agrees with what I got.
• Nov 20th 2012, 03:39 AM
asilvester635
Re: Probability Word Problem homework help
i got 89 for a.)
• Nov 20th 2012, 03:43 AM
asilvester635
Re: Probability Word Problem homework help
I got 45/89 for b.)
• Nov 20th 2012, 03:45 AM
MarkFL
Re: Probability Word Problem homework help
I get a different number for part a). Can you post your diagram?

edit: Did you leave out those who do not own any of the 3?
• Nov 20th 2012, 03:51 AM
asilvester635
Re: Probability Word Problem homework help
Yes so is 93?
• Nov 20th 2012, 03:57 AM
MarkFL
Re: Probability Word Problem homework help
Yes, that's what I have.
• Nov 20th 2012, 04:11 AM
asilvester635
Re: Probability Word Problem homework help
I got 13/93 for c
78/93 for d
8/93 for e

Is that what you got??
• Nov 20th 2012, 04:20 AM
MarkFL
Re: Probability Word Problem homework help
c) no

d) yes, but reduce the fraction.

e) no
• Nov 20th 2012, 04:28 AM
asilvester635
Re: Probability Word Problem homework help
C) 7/93
E) How is it not 8/93? It asks us the probability that a student owns an iPod and a cell phone, and the example tells us that 8 owns a cellphone and an ipod??????
• Nov 20th 2012, 04:31 AM
MarkFL
Re: Probability Word Problem homework help
c) No. You know there are 45 computer owners, so the denominator will be 45.

e) You are neglecting those who own all 3.
• Nov 20th 2012, 04:33 AM
grillage
Re: Probability Word Problem homework help
Right, but there are 6 others that have all three. They qualify don't they?
• Nov 20th 2012, 04:40 AM
asilvester635
Re: Probability Word Problem homework help
ok