Tuesday, July 28, 2009

Stats question help pleez!!! according to a survey of American households, the probability that the residents

own 2 cars if the annual household income is over $25000 is 80%. Of the households surveyed, 60% had incomes over $25000 and 70% had 2 cars. the probability that the residents of a household own 2 cars and have an income less than or equal to $25000 a year is:


A.) 0.12


B.) 0.40


C.) 0.22


D.) 0.18





A Probability distribution is an equation that:


A.) assigns a value to the variability in the sample space


B.)associates a particular probability of occurance with each outcome in the sample space


C.)assigns a value to the center of the sample space


D.)measures outcomes and assigns the values of x to the simple events





In a binomial Distribution:


A.) the random variable x is continuous


B.) the results of one trial aredependent on the results of other trials


C.) the number of trials must be at least 30


D.) the probability of success is stable form trial to trial

Stats question help pleez!!! according to a survey of American households, the probability that the residents
(C) .22





P(2 cars and %26lt;=25K)


=P(2 cars)-P(2 cars and %26gt;25K)


=P(2 cars)-P(2 cars if %26gt;25K)*P(%26gt;25K)


=.7-.8*.6


=.22

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