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blondinia [14]
4 years ago
6

I need help with these two problems. Need an explanation, steps, and an answer.

Mathematics
1 answer:
Black_prince [1.1K]4 years ago
6 0

Let x_1,\ x_2,\ldots,\ x_8 be the scores of the first 8 quizzes. We know that the average of these scores is 85, so we have

\dfrac{x_1+x_2+\ldots+x_8}{8} = 85 \iff x_1+x_2+\ldots+x_8 = 85 \cdot 8 = 680

The average of the first 9 scores is 81, and it is given by

\dfrac{x_1+x_2+\ldots+x_8+x_9}{9} = 81

But we know that the sum of the first 8 is 680:

\dfrac{680+x_9}{9} = 81

And we can solve for the nineth score: multiply both sides by 9:

680+x_9 = 729

Subtract 680 from both sides:

x_9 = 729 - 680 = 49

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