a) In how many ways you can pick 5balls from the urn b) In how many ways you can

Question

a)      In how many ways you can pick 5balls from the urn

b)      In how many ways you can pick 2red and 3 black balls from the urn?

c)      You picked 5 balls from theurn? What is the Probability that yourselection contains 2 red and 3 black balls?

2 - Of all college freshmen who try out for the track team, thecoach will only accept 30%. If 15 freshmen try out for the trackteam, what is the probability that

a)      All 15 are accepted?

b)      At least 2 people areaccepted?

3- USA Today reported that about 20% of all people in the UnitedStates are illiterate. Suppose you take seven people at random offCity Street. Find the mean and standard deviation of thisprobability distribution.

4- It was found that 60% of American victims of health carefraud are senior citizens. If 10 victims are randomly selected,find the probability that exactly 3 are senior citizens.

Explanation / Answer

1) a) 10C5 = 252 b) (4C2)(6C3) = 120 c) 120/252 = 47.6% 2) binomial distribution P = nCr p^r q^(n-r) n=15 p=.3 q=1-.3=.7 a) r = 15, so P = 1.43*10^-8 b) P = 1- (P(r = 0) + P(r = 1)) P = .9647 3) mean = n p = 7(.2) = 1.4 SD = n p (1-p) = 7(.2)(.8) = 1.12 4) binomial distribution P = nCr p^r q^(n-r) n=10 r = 3 p=.6 q=1-.6=.4 P = .0425 P = 4.25%

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.