SOLUTION: twenty-five percent of adults say they would watch straming movies on their phone at work.you randomly select 12 adults and ask them if they would watch streaming movies on their p
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Question 798953: twenty-five percent of adults say they would watch straming movies on their phone at work.you randomly select 12 adults and ask them if they would watch streaming movies on their phone at work. Find the probability that the number who say they would watch streaming movies on their phone at work is(a) exactly four, (b) more than four, (c) between four and eight, inclusive.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
The probability of 
successes in 
trials where 
is the probability of success on any given trial is given by:
\ =\ {{n}\choose{k}}\left(p\right)^k\left(1\,-\,p\right)^{n\,-\,k})
Where 
is the number of combinations of things taken at a time and is calculated by !})
The probability of 
successes in trials where is the probability of success on any given trial is given by:
\ =\ \sum_{r=k+1}^n\, {{n}\choose{r}}\left(p\right)^r\left(1\,-\,p\right)^{n\,-\,r})
The probability of 
successes but 
successes in trials where is the probability of success on any given trial is given by:
\ =\ \sum_{r=k}^m\, {{n}\choose{r}}\left(p\right)^r\left(1\,-\,p\right)^{n\,-\,r})
For all three of your problems, 
, 
, and 
. For problem (c): 
Plug in the numbers and do the arithmetic.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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