The daily value is the percent of a nutrient provided by one serving of food, based on a diet consisting of 2000 calories a day.
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If by plane chart, you mean schedule, then X67 represents the frequency of flight operation - in this case, daily except Saturday and Sunday - a value of X2 would represent daily except Tuesday, etc.
If you increase 500 by 50 daily for 60 days, the value will be 3,500.
The mean is the average. The daily mean would be the average of all the measurements made on a particular day.
"The % Daily Value is the percentage of a nutrient that one serving of the product contributes toward the daily recommended amount." This is based on a 2,000 calories per day diet. For example a food label may say 12g of fat = 18% daily value. This means that 12 grams of fat is 18% of the total 65 grams of fat recommended per day You can use the percentage to decide if there is a low or high amount of that particular nutrient in one serving of the product. Low = 5% or less High = 20% or more
The mean is the average value and the standard deviation is the variation from the mean value.