A student scores 80, 85, and 90 in three subjects. What score must he achieve in

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Question: A student scores 80, 85, and 90 in three subjects. What score must he achieve in the fourth subject to have an average of 85?

Options:

Correct Answer: 85

Solution:

Mean = (80 + 85 + 90 + x) / 4 = 85.\\n\\n255 + x = 340\\n\\nx = 340 - 255 = 85.

A student scores 80, 85, and 90 in three subjects. What score must he achieve in the fourth subject to have an average of 85?

A student scores 80, 85, and 90 in three subjects. What score must he achieve in the fourth subject to have an average of 85?

Mean/Average Calculation – Understanding how to calculate the average of a set of numbers by summing them and dividing by the count.
Algebraic Manipulation – Using algebra to isolate a variable in an equation to find its value.