Many ancient tombs were cut from limestone rock that contained uranium. since most such tombs are not well-ventilated, they may contain radon gas. in one study, the radon levels in a sample of 1212 tombs in a particular region were measured in becquerels per cubic meter left parenthesis bq divided by m cubed right parenthesisbq/m3. for this data, assume that x overbarxequals=3 comma 5493,549 bq divided by m cubedbq/m3 and sequals=1 comma 1641,164 bq divided by m cubedbq/m3. use this information to estimate, with 9595% confidence, the true mean level of radon exposure in tombs in the region. interpret the resulting interval.