My question would be, &quot;What&#x27;s 1?&quot;. I don&#x27;t know if 1 is the mean, 1 standard deviation, 2 standard deviations, etc.<p>I&#x27;d be really worried if 1 was &quot;A fully loaded plane of 180lbs adults with two checked bags of 50lbs each flying in clear blue skies with no wind.&quot;