# Class1ProblemsSolution

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Name A Show all your work. 1. The length of eruption for a sample of eruptions at the Old Faithful geyser are as follows: 74, 60, 60, 81, 72, 80, 80, 68, 73. (2) Find the mean for this data. e éﬂ(\}m&: Hd 4 bor ~ -~ 13 £4% . o, Z | A (b) Find the mode &D\\MC{& é O) g ¢} (¢) Find the median A 2o, Lo, 6%, C(Q,W4, %0 €0 €\ ot = 113 (d) Find the range Q@éﬂ:\')\@fif\)\\\'h = §\—bo= 21 (e) Find the variance 2. N O N L Gl A L Els m—\ &} —\ gi% = 44'(75/ a oy - BB (b) Find the standard deviation for this data. D= MY':?OLPS/ }L
2. According to the NCHS, 20% of the adult population in the U.S. are smokers. (a) If 4 U.S. adults are randomly selected, what is the probability that none of them smoke? RS (;'L > (Qfi K)f: ~Hod (b) If 4 U.S. adults are randomly selected, what is the probability that at least one of them will smoke? RC ik et )) = \ =R V= \~H094= 5@ () If4 U.S. adults are randomly selected, what is the probability that one of them smoke, given that at least one of them smoke? . PO\ legtia) - SOASN ?twé-i(' 1) _ &1s) s Yk L) AL (T)Ww b | =TT 5ogs = 93¢ P
3. The following data represent the medal tallies of the top three countries at a recent Summer Olympics: Country Gold Silver Bronze Total us. 35 39 29 103 China 32 17 14 463 Russia 27 38 Q. Total q Lf 8 % €| 258 If a medal is randomly selected, (a) What is the probability that it is gold? ~ /! U e)= 84 .36 05% (b) What is the probability that it is silver and won by Russia? /%(\@()_: 27/ R@oe: 2L (c) What is the probability that it is Bronze or won by China? Qe Q(&\\'Q(cfi —O(Bnd) 3\ 129 AT S (d) Given the medafi{)was gold, what is the probab'%ty that it was won by the U.S.? U _ By PR, OCUl6)> (fig" ¥q7a—/9;g—g~: 3% 0 G Voo st (¢) Ts the event of getting a gold medal independent of whether it was won by the U.8.?