Question

On his first 5 biology tests, Bob received the following scores: 72, 86, 92, 63, and 77. What test score must Bob earn on his sixth test so that his average (mean score) for all six tests will be 80







tell me fast​

Answer 1

Answer:

65

Explanation:

72 +86+92+63+77=390

and the six no be x

so 390x/6 as the mean

x=390÷6 =65

so , the answer is 65

Answer 2

Answer:

90

Explanation:

Given marks of Bob's five tests are:

72 + 86 + 92 + 63 + 77

To get an average of 80 on six tests we will need to multiply 6 tests to average of 80.

So,

6 × 80 = 480

Adding the marks of given five tests is

72 + 86 + 92 + 63 + 77 = 390

Now, to get the marks for Bob's next test, which is the sixth test, we should subtract 390 from 480.

So,

480 - 390 = 90

Therefore, Bob needs to score 90 marks on his sixth test to obtain the average of 80 for all the six tests.

To know more about Mean click the link below

https://brainly.in/question/42931457

To know more about Median and Mode click the link below

https://brainly.in/question/21806843

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