Question

For her biology class kayla earned the following grades: 83, 86, 96. What grade must she earn on the last test to earn a test average of 91​

Answer 1

Kayla must score a 99 on her last biology test to achieve an average of 91 for the class, as determined by calculating her total current points and the desired total points for her average.

Step-by-step explanation:

To calculate the grade Kayla must earn on her last test to achieve an average of 91 for her biology class, we must first calculate the total points she has earned so far and the total she needs. She has scored 83, 86, and 96 on her tests. To find out the grade she needs on the last test, we use the following steps:

• Multiply the desired average by the number of tests (91 * 4 = 364).
• Add her current scores (83 + 86 + 96 = 265).
• Subtract her total scores from the desired total (364 - 265).
• This gives us the score she needs on her last test (364 - 265 = 99).

Therefore, Kayla must score 99 on her last test to achieve an average of 91 in her biology class.