A student's grade depends on her score on four equally-weighted exams. Her average on the first three exams is 92. What must she score on the fourth exam in order to guarantee a final average of at least 90?

3x92 = 276 (first 3 exams)
average of at least 90 (90 x 4 = 360)

360 - 276 = 84

Answer
she needs to score at least 84 on the fourth exam in order to guarantee a final average of at least 90

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shivishivangi1679 shivishivangi1679 · Answer 2 · 2022-06-09T16:50:05+02:00

She needs to score at least 84 on the fourth exam to guarantee a final average of at least 90.

What is average?

The average is defined as the mean value of the given data which is equal to the ratio of the sum of the data value to the total number of units present in the data.

Average = the sum of the data value / the total number of units

A student's grade depends on her score on four equally-weighted exams. Her average on the first three exams is 92.

3 x 92 = 276 (first 3 exams)

The average of at least 90

(90 x 4 = 360)

So, 360 - 276 = 84

therefore, she needs to score at least 84 on the fourth exam to guarantee a final average of at least 90.

Learn more about average here;

https://brainly.com/question/13496328

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