Math Second Test 2020

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

2023
Views:

492

Pages:

2
Author:

Leilani Contreras

.. Ql Q2 Q3 Q4 QS QG Q7 Q8 Q9 Q10 Qll Q12 a a a a a a a a a a a a b b b b b b b b b b b b c c c c c c c c c c c c d d d d d d d d d d d d e e e e e e e e e e e e I ) A random sample x.,x2 , •• .,x15 with size 15 is selected from a population that is N(50, 15 2 ). Another independent random sample y 11 y 2 , ... ,y10 with size 10 is selected from a population that is N (40, 102 ) • Let X be the average of the first sample and sam le. '(hen P(X - I-< ll)equals 0 55 b) 0.322 1 c) 0.4332 d) 0.2110 e) 0.5443 uppose that I 0% of the students of Jordan University wear glasses . In a random sample of 100 Jordan r I University students, the probability that at least 15% w~a · In a) 0.9525 b) 0.2911 c) 0.1724 d) 0.0475 e) 0.8137 r ~ ~r lo HA 3) Find the 90th percentile P90 of the F(3,6) distribution. ~ ) 5.28 b) 0.303151 c) 0.189394 d) 0.27991 e) 3.29 ,,--.... _ - Y be the average of the second 2) t. p .... ' a random sample of size 21 selected from a population Find the 10th percentile P 1:. ofthe variance s·of that has the .\'(.u~-..,,_ ~ a) 16.66 c) 14.44 d) 12.22 If X- .\'(50, 100) then the 90th percentile P~,_, of X equals b) 68.8 c) 70.8 d) 72. 8 c&JfD e) 13.33 e) 66.8 6) The number of cars arriving for parking during a given 5 minute period (in a rush hour) is distributed according to Poisson distribution with average 2 cars every 5 minutes. What is the probability that at most 2 cars will arrive for parking during 10 minutes in that rush hour? a) 0.762 301131 b) 0.677 ~ d) 0.433 Second test e) 0.776 Summer 2007/2008 2 7) Suppose that a sample of s ize 16 is randomly selected from .\"(40,d) distribution. If , - . Xand S~are the 4(X--t0) sample mean and variance, respectively, then the distribution of s is a) S(O, 1) ( 6 f )he t-d istri butio n w ith 15 degrees of freedom ----cy-the z'l d istribution with 15 degrees of freedom d) a normal distribution w ith mean 4 e) none of the above 8) A car driver will keep on violating traffic rules until he gets caught by police. If the probability that the driver will be caught is 0.25, find the probability that the driver will be caught at his 4nh violation of the traffic rules. ~ ~ a) 0 . 19007 e) 0. 18137 b) 0.11037 d) 0.17017 9) A machine produces about 5% of its output defective. In a bag of I 00 such outputs, the probability of having at most I ~ls d) 0.1007 a) 0 .8993 c) 0.9003 e) 0.0197 S-__~ 10) If X has the binomial distribution with n = 10 and p = 0.5 then b) 0.734 d) 0.890 a) 0.690 c) 0 .998 P- - 11) A random samp le of size 2 1 is selected from a population that has the '!-."(µ,1 s- is less than 13.56. b) 0.99 c) 0.01 e . ~variance ~ 12) Let X-S(15, a) 12 301131 d). If b) d) 0.9 P(X> +t.6) = 0.015 then o equ~ 14 c) 8 ~ Second test e) 0.95 e) 6 Summer 2007/2008

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