A company produces packets of soap powder labeled "Giant Size 33 oz". Past testing of the production process has allowed the quality control (QC) manager to determined that when the process is properly calibrated, the actual weight of soap powder in such a box has a Normal distribution with mean of 33 oz and standard deviation of 0.7 oz. The production specifications indicate that the weight of each box should be in the range from 32 oz. to 34 oz. A box of soap is considered underweight if it weighs less than 32 oz.
If the process is properly calibrated based on the distribution given above, what is the proportion of boxes that are NOT underweight?