Question

30. 401(K) INVESTORs According to a study conducted in 2011 concerning the participation, by age, of 401(k) investors, the following data were obtained: 60s 50s 40s 30s 20s Age Percent 10 27 28 23 12 a. What is the probability that a 401(k) investor selected at random in 2011 was in his or her 20s or 60s? b. What is the probability that a 401(k) investor selected at random in 2011 was under the age of 50? Source: Investment Company Institute. 28. CLIMATE CHANGE In a survey of 1089 adults conducted by Duke University between January 16, 2013 and January 22, 2013, the following question was asked: How serious a threat is climate change? The results of the survey are summarized below: Somewhat Not that Not at Very serious all Answer much seriouS 46 Respondents (%) 38 On the basis of the results of the survey, what is the prob- ability that a person chosen at random from the survey said that climate change posed: a. A very serious threat or a somewhat serious threat? b. No threat? c. A somewhat serious threat or not that much of a threat? Source: Duke University 30. A pair of fair dice is rolled. What is the probability that: a. The sum of the numbers shown uppermost is less than 5? b. At least one 6 is rolled? 32. RoULETTE What is the probability that a roulette ball will come to rest on an even number other than 0 or 00? (Assume that there are 38 equally likely outcomes con- sisting of the numbers 1-36, 0, and 00.)

Answer 1

Date Page No. 30 12 loo 0.12 10 to-1 , 22 SO 0.12. 0.23土0.29 0.63 C14),(1,5 ) ( ) 44) (42) (4,5) 1, 6 3) (2 (2,S) C21 6 (2, 1 (2,2) C3,1 (3,2) (33) (31) (3,5) C3,G) (31) (42) (43) (414) (4,s) the (SI) (5,2) (5,3) (51) (S,5) (5,s (G1 6,2) (63) (G4) (GSbis) 3 6 36 DELTA Notebook

Date Page No 6 to 36 36 36 26 0.84 Lud 0-46 6 1 38 DELTA Notebook