PercentageTo calculate a percentage, we divide the number by the total number and we multiply the result by 100.(If we just do , the result is called the frequency). If in a class there are 9 handsome boys and 6 boys that are less handsome, since , this means that there are 60% of the boys in the class who are handsome (There will not be enough for everybody). If a tennis player serves 90 first serves and is successful with 28 of them, his percentage of first ball is 31%. If a pie weighs 500g and Mary eats 80g of it, she will have eaten 16% of the pie. You can verify these results with the help of the formula to calculate percentages. MeanTo calculate a mean, we add all the values and we divide the result by the number of values. If you had 6, 4, 8, 5, 4, 9 at your math exams and after having read this site you get 16, your mean mark for math will be .Accumulated numbers
To calculate the column of accumulated numbers, we add the new value each time. |