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Missing information - you need the worth (weight) for every grade, not just for some of them. The way you calculate this so-called "weighted average" is to multiply each grade by its weight, and add everything up. Then you divide by the total "weight". Example: exam 1: grade is 80; weight is 40. exam 2: grade is 70; weight is 60. 80 x 40 + 70 x 60 = 3200 + 4200 = 7400. Divide this by the total weight (40 + 60 = 100), and you get a weighted average of 74.
To calculate your new grade after receiving a 75 on a test, you need to know the weight of the test in relation to your overall grade. Let's assume the test is worth 20% of your total grade. You would calculate the impact of the test by finding 20% of 75, which is 15. Adding 15 points to your current grade would depend on the weight of the test and the rest of your grades in the class.
Grade scores are an ordinal level of measurement. A ratio level of measurement would be weight of a person or how much money a person has.
Units used in the USA are customary. Inches, feet, yards and so forth including some that are archaic. Fluid ounces, cups, pints, quarts, gallons and so forth. Dry measures are usually converted to weight like ounces and pounds. Bushels, pecks and so forth are considered old.
Tell him at lunch. And try not to be around anybody when you tell him.