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    whiteblackgirl08's Avatar
    whiteblackgirl08 Posts: 1, Reputation: 1
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    #1

    Dec 11, 2007, 10:08 AM
    statistics, probability
    The EPA has reported that the average fuel cost for a particular type of automobile is $800 with a standard deviation of $80. Fuel cost is assumed to be normally distributed. If one of these cars is randomly selected, what is the probability that the fuel cost for this car exceeds $760?:confused:
    vingogly's Avatar
    vingogly Posts: 718, Reputation: 105
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    #2

    Dec 12, 2007, 01:04 PM
    Calculate the Z-score: z=(x-mean)/sd; given that Z-score what does your probability table for Z-scores tell you? (hint: the variables x, mean, and sd are all in your question)

    Also, note that there's a special forum for homework help so this should have been posted there...

    Vasily
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