in mei lins school, her science teacher gives tests that are marked out of 100. mei lin has an average of 60 marks on her first four science tests. on the fifth test she got 80 marks. what is the average of mei lins marks in science after all five tests?

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02-04-2021
Mathematics

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in mei lins school, her science teacher gives tests that are marked out of 100. mei lin has an average of 60 marks on her first four science tests. on the fifth test she got 80 marks. what is the average of mei lins marks in science after all five tests?

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tanweeleong195oxyqwp tanweeleong195oxyqwp · Answer 1 · 2021-04-02T06:22:24+02:00

tanweeleong195oxyqwp tanweeleong195oxyqwp

02-04-2021

Answer:

64

Step-by-step explanation:

Lets take mei lin's first four test scores to be 60 since it average out to be 60.

After the 5th test,

mei lin new average score is

[tex] \frac{new \: total \: score}{total \: number \: of \: tests} \\ = \frac{60 + 60 + 60 + 60 + 80}{5} \\ = \frac{320}{5} \\ = 64[/tex]

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andromache andromache · Answer 2 · 2022-03-29T15:32:37+02:00

The average of mei lins marks in science after all five tests is 64.

Calculation of the average:

Since her science teacher gives tests that are marked out of 100. mei lin has an average of 60 marks on her first four science tests. on the fifth test she got 80 marks.

So here the average be like

= (60 + 60 + 60 + 60 + 80 ) / 5

= 320 / 5

= 64

hence, The average of mei lins marks in science after all five tests is 64.

Learn more about an average here: https://brainly.com/question/9882283