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Unformatted text preview: Simmons
65 1. pts.) Suppose, when looking at the hair color and eye color of an individual], that o 21 % have blond hair
0 37 % have brown eyes
0 2 % have blond hair and brown eyes In the problem below, consider randomly selecting an individual and recording their hair
color and their eye color. In your computations below, please use: H ¥
H = ﬂair is blond E
E = Eyes are brown a. Are H, E disjoint? Why or why not? Hn E 4 ¢ (ma... Rave—blaml m: me (m) b. Show me, using the deﬁnition, that H, E are not independent (i.e. are dependent). ,oz: WHnE) 1: PM) WE) = (11.37): ,07770
W
50 [4,5 [194' RM c. What is the chance an individual has either blond hair or brown eyes? NHWE): rm2+V(s)»V(Ha._16)
: .214— '37 (DZ. 7. .56'
d. What is the chance an individu
H = (Ff/‘5‘) u (we) PM): WH/lE‘) + Fame)
L‘lme .21: PHI/159+— .01
\ '2 PHI/15:4): ,ZI.o1=<.l7) e. If an individual has blond hair, what is the chance they have brown eyes? CEIH = V(E/)H)_ :25 :
P ) PM) ‘ ~11 ’@ ‘ This is based on data collected by Snee, R. D. (1974), “Graphical display of twoway contingency tables”, i
The American Statistician, 28, 912. I’ve rounded the numbers a bit to make the arithmetic easier. i
l 2. (15 pts.) In the ‘Florida Lotto’ one selects 6 distinct numbers shown on a playing card
showing the ﬁeld of numbers 1, 2, . . ., 53. How much money you win depends on how
many of your selected numbers match the 6 numbers eventually chosen as winners (these
6 numbers also being drawn without replacement). Here is the payout table for placing a
$1 bet: FLORIDA LOTTO
Number of Matches Estimate Prize (Gross Winnin_ ) $5 Write, in terms of binomial coefﬁcients, the chance you have gross winnings of $70. {(541955 (amid/’42): 37°) : €2< :7)
(53
5 25 C
3. (96 pts) Suppose 5% of and 1% of are olorblind Also suppose 2/3 of all
 e, . s students at SDSM&T are m and 1/3 of tudents at DSM&T are female. i
l Consider drawing an individual at random from the SDSM&T student population. a. What is the chance that the student is colorblind? / W5): FKCIMMMM ﬂaw) You) : Cos)(%)* (“My 1:. b. If a colorblind student is selected, what‘is the chance that they are male?
WM'C) : V(Clm)V(M)
[7(a) 605)(1/3) (05M "6) +6“) C "3) X (26 pts.) Tetrahedral dice (i. e. dice in the shape of a pyramid), when thrown, are
equally likely to show a 1, 2, 3, 4. a. A single tetrahedral die is tossed k times. What is the chance of at least one 2
appearing (your answer will be in terms of k)? b. A pair of tetrahedral dice are thrown k times. What is the chance of at least one double
2 appearing (your answer will be in terms of k)? (9 Wat/mm 1)= Mm 1) l’(~bcloubb. '2‘) (5" I5 1. (26pm) A former student of mine indicates the following game could be played at the
“Clock Tower Lounge” in Rapid City: You bet 25¢ for the privilege of throwing 5 dice; only one play is allowed per day. Here
is the associated payout table: “3 of a kind” means a particular number comes up 3 times and the other two dice take on
other values. “4 of a kind” means a particular number comes up 4 times and the other dice is another
value. . “3 of a kind” means all five dice take the same value. Problem: Determine the three probabilities, clearly labeling which is the chance for ‘3 of
kind’, which is the chance for ‘4 of a kind’, and which is the chance for ‘5 of a kind’. Hint: When looking at, say, the ‘3 of a kind’ event, split it into ‘3 ones’ or ‘3 twos’ or. . .
or ‘3 sixes’. ((30%?4 kid) ' V( 30% 93‘ 344495 a! moo Efﬁa) = H3 My)» V( 3414:»)4'H' “F W3 5‘“25) : (prawn (;)amr+~+ (WW
.— éaﬁtwm; ’ 4%)(éiéf a. I
awe Withékml)‘: .455 .éHE) mama W272}. m1): 6(§)(sz(§)°¥ p. 0007'?...
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 Spring '04
 JOHNSON
 Statistics

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