Question 919719: During the last student elections at a certain college, 45% of the students voted for the democratic student party. A simple random sample of students from this college is to be selected.
If 12 students are selected, what is the probability exactly 7 of them voted for the democratic student body?
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! p(dem) = .45, n = 12
P(x = 7) = binompdf(12, .45, 7)
Recommend Using stattrek.com to check Your TI Calculator Results
until You are comfortable using it.
re TY
So good...to hear You checked: 12C7(.45)^7(.55)^5 with Your Calculator!!!
Music to my ears!!!
For ex: When it comes to cumulative Probabilities...
P(x ≤ 7) You will be very...happy to be able to Use binomcdf(12, .45 , 7)
as
P(x ≤ 7) = P(0) + P(1) + P(2) + P(3) + P(4) + P(5) +P(6) + P(7)
:)
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