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danny.kay
12-24-2006, 07:45 AM
According to National Highway traffic Safety Administration 66% of California motorists use seat belts. Find the probablity that in one group of 12 California motorists exactly 8 wear seat belts. Use the given Values of n,x and p. Use the binomial probablity formula as well.

Please, someone help me. I'm lost in this problem.

Thank you.

elnaz
01-28-2007, 11:14 AM
hello
n=12
x=8
p=.66
X~bin(n,p) , p(X=x)=p(X=8)~0.2 of table of binomial

Foster
02-01-2007, 03:06 PM
mean=500
standard deviation=100
What is -score for 585?
Use the -score to find the proportion of test scores that are less than 585?
What -score =70th percentile?
What raw score corresponds to the 70th percentile?

I am so confused. Is there anyone out there that can solve this for me or give me a clue?

nurserascal
02-01-2007, 05:58 PM
hello
n=12
x=8
p=.66
X~bin(n,p) , p(X=x)=p(X=8)~0.2 of table of binomial

n is the population statistic in this problem.
x is the sample in this problem. and p = the precentile in the problem. am I understanding your answer correctly.
and you multiply all three to get the final answer..........correct??
i am also struggling to understand. thanks for your help
:tup:

elnaz
02-01-2007, 09:31 PM
hello
you should study about binomial distribution
n:sample size
p: probability of success
x:number of success in sample size
in this question success is use seat belts