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A lab has conducted many measurements in the past on water samples from a particular source to…

 A lab has conducted many measurements in the past on water samples from a particular source to determine the existence of a certain contaminant. From their records, it was determined that 50% of the samples had contamination less than 5.3 parts per million, while 95% had contamination less than 7.3 parts per million. If a normal prior is going to be used for a future analysis, what prior do these data determine?