In this case, the robust estimates for premium bearings are quite close to the median (1539.72). Since none of these measures are near the mean, this may be an indication that the distribution is not reasonably normal.

The table of extreme values lists the five highest and lowest values for each Alloy. The premium bearings range from five standard deviations above to one standard deviation below the mean. At times, these can withstand much higher heat than standard bearings and never fail below 1530 degrees centigrade.