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Unformatted text preview: Bob-(0013 «(pasta mg 53', Name w‘! 1. affix" U1 . " 1 . ' - . ' ' «LL/W ’ 1'19 ' 4. Which of the follovvmg statements IS true? . me {:35 may“? - = r . _ *1 —‘ . .1 a. The events A and B are mutually exclusive. / f n .1- Mi” «in q . .3 .3 a.“ b. The intersection ofA andBis the set [6, 8, 10, 12]. 6 1Ca\%© '38 W. 1 ' “58,3952? c.. The events A and B are c/oflegtlgely eflapitrve. , .2 w v.1 tue’tjr‘. . . a {etc-i . None ofthe above. L” th (3 fl at?“ at "L {yeast/viii” Via-34¢ . m _ Same («rim—QC)“ 5 \m f L 4‘ 5. The probability that a person catches a cold during me% and flu season 1% 0. 4. 3 Assume that {d ‘ " W 5 LEETE 10 people are chosen at random What IS the probability that exactly”, four of them Will catch a W" cold? QCZLDZ £0201.) FL' 4‘ v:— '1‘. )1 i . r R; L < P} n A" )f I . --.-ww———~—~—-.—— L5 )0.4— " 1.— LL: / 0-111 at (LL-L L... L. , Leo-4x. ‘rvw H . b. 1 l a (1‘14; I {1 l, “" 19° ii .. A. b. 0.160 ft ~ , L K .“ ”I blflfm :1. Cal 0 0 240 -QAWILLLLTWH O 4 ( ~ \ {9 ca... 1 ' ' ' L7: 3 ' «4i O-{cu' Wt“ 0.251 ma. L- L ., - . W t e 25‘: 6. On average, you receive 2. 6 pieces of Junk mail a day. Assume that the number of pieces of junk mail you receive each day follows the Poisson distribution. What 1s the probability that you receive exactly three pieces of Junk mail today? L xvq L M M 240 mix 33 a 0198 P33 7' L #:9240/ 5 \L b. 0.233 A 2 -2\8 @0218 3 ‘. 7. Checkout times in a Wal-Mart store follow an exponential distribution with a mean time of 8 minutes. What IS the probability that the checkout time for the next customer will be 6 minutes 1%“ oriess? M: ED 9L: ”at w . ..-L~.:LL 2 W32? & Q 0-528 PU: "-b) we ”if. b. 0.472 We) : 1L“ 6 , ‘3“? c. 0.972 g a,“ @1571: d. 0313 ~ .526 8. Among college professors, it was found that the amount of money spent on entertainment each week was normally distributed with a mean of $95. 25 and a standard deviation of $27 32 What 15 the probability that the spending of a sample of 25 randomly—selected professors will exceed $102 50? * 10“ s M 615 2C; 1. a . . . 2 2M, 2'. 3:233 , mm s ‘ l @ 03936 P(>< >102.Sb\) aishLLLLL’nm . 01”}? "‘02-‘30 = 3?. draw d. 0.9082 102 ST: — ‘35 2§+M saw? fit .. 1hr?) 3' 7- 'I H.“—“h 0 ‘ h We}, P? L 10 Z 7 23%.31 +sinm6iétflfi ' CHM? 3: . “Entities lee/idioms?) :33 / fivmhorn /’ Oil“? L "pkg >. 2L5) 3 ‘ v cones/meat: L a (poet a 31? K h. L A. v rower—L 1‘ 0" 1163?; eta-L; : $01561 :3 b 0““! 18‘0"? 0n iabla, ...
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