The difference between sub total and grand total is the components that make up the price. The subtotal comes before the grand total and does not include items like shipping and tax. The grand total is the final price that does include those items and is the final price that must be paid.
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This question is not clear. Calculating sums of a list of numerical values is called addition. The sum of a single list of related lists is called sub total. Finding the sum of all sub totals is called grand total.
This subtotal is missing something.
The first part of the problem we take an object and break it down to four equal subset. Mathematical written as 1/4. The next step is to further divide each of the four subsets into four sub-subsets. That will give a total of sixteen sub sets of the whole. 1/4*1/4=1/16 or object divided into subset, subset, subset, subset and then each subset divided into sub-subset, sub-subset, sub-subset, sub-subset. Gives a total of sixteen sub-subset
An estimate for the mean of a set of observations is just that - an estimate. Another set of observations will give a different estimates. These estimates for the mean will have a distribution which will have a standard error. If you have two sub-populations, the mean of each sub-population will have a standards error and the se of the difference between the means is a measure of the variability of the estimates of the difference.A typical school work example: the heights of men and of women. There will be a mean height for men, Hm, with a se for men's heights and a mean height for women, Hw, with its own se. The difference in mean heights is Hm - Hw and which will have an estimated se.
mass fraction of Substance A = (mass of Sub. A) / (total mass)