University:
Kentucky State University
Course:
MAT 120 | Precalculus
Academic year:

2024
Views:

114

Pages:

3
Author:

folclord7m

.. ~\~ :•~\~ J1,.A~ ,, J-'IA :,.,_.'ii :~t~ \ l(G~ I CJ Q.l Q4 QS QS qi a I I I O> I b ~ Ql lj . ~ It h " 11 t ~ t 4 d d (!j1 • ' • ~ • I QIO • Multiple Choice ldent(fy the choice that best completes the statement or answers the question. l ) Let X have the Poisson distribution such that P(X=O) = 2P(X= l), then P(X=O) equals a) e-• 3 e-2 b) c) e-• d) e -I '2 e) e - 1/ 4 2 2) Let X- Normal (20, 4 ) , then P(X > 22) equals a) 0.9483 d) 0.69 15 e) 0.1915 b) 0.3085 c) 0.0517 3) Let X- Binomial(I00,0.2), Us ing the normal approximation to the binomial distribution, P(l4 2) equals 5/9 b) 6/9 e) 4/9 d) 3/9 e) b) -1/2 c) 2 11,/2 2, then Yar(2X +Y-1) equals 18 1/9 Essay I I) Let X be the mean of a random sample wit variance cl == 25. a) What is the distribution of X? ,,- ) ( --v i- b) Find P(X select~ populafon tbat has meanµ >. == 8 and i1.C64, /V( g , - 2'1 ) £c.-t > 7) '). c) Find a such that P(a < "j/g P( Cl_:::Z Z c. < X < 8) == 0.3. 0 ) -=.o .] -p( !:I g(~ -t) .? t /. 12) The number of people entering a sto random variable that has a Poisson distribution with mean 3 people per minute. Compute the following a) the probability that 5 persons enter the store in a given minute. ~ pc><-=f) c)- ~Ph) =o- luu.¥ b) the probability that at most 2 enter the store in a period of two minutes. (}~ f (X~ f 2) .~ U,Obl 3 q1 p ( t)

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