52. A study of two hundred computer service firms revealed these incomes after t

Question

52. A study of two hundred computer service firms revealed these incomes after taxes: afte Under $1 million 102 61 37 $1 million up to $20 million S20 million and more What is the probability that a particular firm selected has $1 million or more in income after taxes? a. 0.25 b. 0.49 c. 0.51 d. 0.74 53. A firm offers routine physical examinations as part of a health service program for its employees. The examinations revealed that 8% ofthe employees needed corrective shoes, 15% needed major dental work, and 3% needed both corrective shoes and major dental work. What is the probability that an employee selected at random will need either corrective shoes or major dental work? a. 0.20 b. 0.25 c. 0.50 d. 0.75 54. A tire manufacturer advertises, the median life of our new all-season radial tire is 50,000 miles. An immediate adjustment will be made on any tire that does not last 50,000 miles." A consumer purchased four of these tires. What is the probability that all four tires will wear out before traveling 50,000 miles? a. 1/10 or 0.10 b. 4or 0.25 c. 1/64 or 0.0156 d. 1/16 or 0.0625 55. There are ten microchips in a box and three are defective. Two microchips are selected without replacement. What is the probability of selecting a defective microchip followed by another defective microchip? a. 4 or 0.50 b. 4or 0.25 c. 1/120 or about 0.0083 d. 1/15 or about 0.07

Explanation / Answer

52)probability =(61+37)/(102+61+37)=0.49

option b

53)

P(need either of two) =0.15+0.08-0.03=0.20

option A

54)

probability that all last before 50000 miles=(0.5)4 =1/16 or 0.0625

55)

P(2 dfective) =(3/10)*(2/9)=1/15 or about 0.07

option D

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