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    Midrange, first quartile, mean, standard deviation

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    Sixteen retail outlets were surveyed to find the cost of a window chiller. The results are 280,310,265,298,285,325,360,340,260,275,295,280,355,295 and 355.
    find the midrange
    find the value corresponding to P50
    find the first quartile (in dollars)
    find the mean
    find the unbiased standard deviation
    what is th z-score, correct to the nearest hundredth, of the data entry 260

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