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MathSofiya
Group Title
More statistics.
Binomial Probability
\[P(r)=\frac{n!}{r!(nr)!}p^rq^{nr}=C_{n,r}p^rq^{nr}\]
The problem states 10% of adults deliberately do a one time fling (purchase clothing, wear 'em to an event, and return 'em).
In a group of 7 adults what is the probability that anyone has done a one time fling?
I figured that:
n=7
r=0
I plugged those into the equation:
\[P(0)=\frac{7!}{0!(70)!}p^0q^{70}=C_{7,0}p^0q^{70}\]
What about p and q?
The probability of success (p) is 0.1 (1% of people do one time flings)?
and q would be 0.9? Would that be right?
 one year ago
 one year ago
MathSofiya Group Title
More statistics. Binomial Probability \[P(r)=\frac{n!}{r!(nr)!}p^rq^{nr}=C_{n,r}p^rq^{nr}\] The problem states 10% of adults deliberately do a one time fling (purchase clothing, wear 'em to an event, and return 'em). In a group of 7 adults what is the probability that anyone has done a one time fling? I figured that: n=7 r=0 I plugged those into the equation: \[P(0)=\frac{7!}{0!(70)!}p^0q^{70}=C_{7,0}p^0q^{70}\] What about p and q? The probability of success (p) is 0.1 (1% of people do one time flings)? and q would be 0.9? Would that be right?
 one year ago
 one year ago

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MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
@hartnn
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
@mathslover ?
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
are u sure about n=7, r= 0 ?
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
out of 7, any'one' has done a one.... so do u feel r should be 1 ?
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
the probability of success = probability of flinging = p = 10% = 0.1 \(\checkmark\) the probability of failure = probability of not flinging = q = 90% = 0.9 \(\checkmark\)
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
just clear your confusion about, n and r
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
oh sorry I was gone for while. Let's see here. Give me a second to read everything. Sorry :S
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
Ok so about n and r. #number of trials How do I relate that to this problem? I guessed that n=7 because it looked nice, but I don't have a good explanation for why I picked it
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
I meant n=# of trials
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
number of trials or events or no. of creatures/people on which experiment is performed = n =7 here, \(\checkmark\)
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
r is the number of people 'chosen' here probability that anyONE has done fling implies, r=1 make sense? or more explanation?
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
so when we say r=0...
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
almost never.....when we don't perform experiment.....maybe there are some special case for this
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
make sure u understand why n=7, r=1 here
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
When no one has done a fling wouldn't that be r=0?
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
umm, yes i think so....(0.9)^7 seems right
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
a) No one has done a onetime fling? r=0 b) At least one person r=1 c.) No more than two people \[r \ge 2\] That's how I calculated it, whatcha think?
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
b)P( atleast 1 person) =1P (no one )
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
no more = less r<=2
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
oh yes. sorry.
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
exactly 1>r=1 atleast 1 = 1 none
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
atmost 1 > r<=1
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
make sense ?
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
Yes, I think so.
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
Can I show you what I did for another problem. I think my thought process is right. Feel free to point out any errors.
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
i will. yes show
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
Trevor is interested in purchasing the local hardware/sporting goods store in the small town of Dove Creek, Montana. After examining accounting records for the past several years, he found that the store has been grossing over $850 per day about 60% of the business days it is open. Estimate the probability that the store will gross over $850 (a) at least 3 out of 5 business days. (b) at least 6 out of 10 business days. (c) fewer than 5 out of 10 business days. p=.60 q=.40 a.) n=5 because "number of trials or events or no. of creatures/people on which experiment is performed " => In this case we have a total number of 5 days (events/trials) at least 3 out of 5 would mean: r>=3 To calculate this I would do P[r=3]+P[r=4]+P[r=5] b.) n=10 r>=6 To calculate.... P[r=6]+P[r=7]+P[r=8]+P[r=9]+P[r=10]
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
and did u get correct answer for the problem posted ? n=7,r=1,p=0.1,q=0.9
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
and for (c) n=10 r<5
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
all n, r selections \(\huge \checkmark\)
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
Yaaay!!!!! For the first problem I got a.) 0.478 b.) 0.522 c.) 0.974
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
sorry, i didn't do calculation part, i thought u had answers to verify, method is correct
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
I did have the answers =)
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
Thank you once again my friend!
 one year ago

hartnn Group TitleBest ResponseYou've already chosen the best response.2
so did they match? welcome ^_^
 one year ago

MathSofiya Group TitleBest ResponseYou've already chosen the best response.0
yes sir!
 one year ago
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