Auniversity student earned grades 84, 78, 84, and 72 on his four regular tests. he earned a grade of 78 on the final exam and 86 on his class projects. his combined homework grade was 87. the four regular tests count for 40% of the final grade, the final exam counts for 30%, the project counts for 10%, and the homework counts for 20%. what is his weighted mean grade? round to one decimal place.

His weighted mean grade is 81.2.

Step-by-step explanation:

His weighed mean grade is given by the following formula:

We have that RT is the mean of the regular tests. The student earned grades 84, 78, 84, and 72 on his four regular tests. So the mean is

F is the grade on the final exam. He earned a grade of 78 on the final exam, so

P is the grade of the project. So .

H is the homework grade, so .

So

His weighted mean grade is 81.2.

step-by-step explanation:

the true ones are a b and d

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answer: d.) the total number of protons and neutrons is 15

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