请教一概率问题# Economics - 经济
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A headline in the Wall Street Journal (June 12, 1992) reported” “Sears Is
Accused of Billing Fraud at Auto Centers”. The article reports on a year-long
study by the California Department of Consumer Affairs in which undercover
agents established that 89.5% of the owners of cars with worn brakes but no
other mechanical defects were told that additional and more expensive repairs
were needed. “In a second phase, the department informed Sears of the
investigation in December 1991 and then conducted
Accused of Billing Fraud at Auto Centers”. The article reports on a year-long
study by the California Department of Consumer Affairs in which undercover
agents established that 89.5% of the owners of cars with worn brakes but no
other mechanical defects were told that additional and more expensive repairs
were needed. “In a second phase, the department informed Sears of the
investigation in December 1991 and then conducted