Basic Temperature Error MET
It is easy to think that the only circumstance in which the FLFL —Flight Level and altitude could be the "same thing" is in ISAISA —International Standard Atmosphere, but this is not the case - this could also happen if pressure and temperature were changing the altitude but in opposite directions - ie cancelling each other out. Therefore with this question, if the pressure is high (1013) then the temperature is low and if the pressure is low (<1013) then the temperature is high.
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You are flying at FL175 and the true altitude is 17500 ft. The QNHQNH —Static pressure at MSL calculated from QFE using ISA temperature lapse rates is 993 hPa. What can be said about the air mass in which you are flying?