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Midrange, first quartile, mean, standard deviation

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