Best Answer

(77+83+89+86+x)/5=85

(335+x)/5=85

(335+x)=85*5

335+x=425

x=425-335

x=90

He must get 90% on his fifth test to average 85%.

Study guides

☆☆

Q: What score must he get on his fifth test to average 85 percent for all five tests if his first four scores were 77 percent 83 percent 89 percent and 86 percent?

Write your answer...

Submit

Still have questions?

Continue Learning about Basic Math

Into what kind of percentage do you want to convert it? A percentile already is some kind of percentage. It says that so-and-so many percent score above (or below) your score (or whatever score you are considering). The actual score (percentage or otherwise) can't be deduced from the percentile, unless you look it up in a table of scores. For example, if you are in the top 20 percentile in an exam, and there are 1000 students, get a list of the scores - sorted from high to low - and count the first 20% of scores - in this example, the scores for the best 200 students. The student at position #200 will be the answer.

There will be an overall increase in the first number.

First 100 percent is 600, so 200 percent is 1200, 300 percent 1800. Then 60 percent of 600 is 360. so 360 percent of 600 is 2160.

To calculate the Percent to Plan, you can first substitute the variable X for the percent and the variable Y for the Plan, and then you can solve for the end rate of percent to plan easily.

11 (eleven) is the fifth prime number. The first ten primes are: 2, 3, 5, 7, 11, 13, 17, 19, 23. So 11is the 5th prime.

Related questions

50%

There is a 25% improvement.

first of all i dont know. second of all use a calculator

For apparent magnitudes, a magnitude of zero has the same magnitude as Vega. A first magnitude star is 40 percent as bright and a fifth magnitude star is one percent. So, a first magnitude star is 40 times as bright as a fifth.

46

An average is worked out by dividing the total of the scores by the number of scores. You have 4 scores already so when you have done the next test it will be 5 scores. If you multiply 5 scores by 90 it gives you a total score of 450. The 4 scores you already have adds up to a total of 354. If you subtract 354 from the 450 you get 96 and that is your target for the final test. The average for the first 4 tests comes out at 88.5

-- To average 70 on four tests, the total of the scores has to be 280 .-- You already have (64 + 69 + 73) = 206 on the first three tests.-- You need (280 - 206) = 74 on the fourth one in order to average 70 on all four.You can do it !Is that kind of what you were asking ?

120 percent of 300 is 360. You first take out the 100 percent; that is 300. You now have 20 percent left, which is a fifth, so you divide 300 by 5, which equals 60, and add that to 300. 300+60= 360.

first, add 200%+89%=289%. then divide by two and you get 144.5%

423%2BS=600 Solve that to complete the problem. Let +x+ = her 5th score [ average of scores ] = [ total of scores] / [ number of games ] +120+=+%28+115+%2B+84+%2B+123+%2B+101+%2B+x+%29+%2F+5+ +600+=+115+%2B+84+%2B+123+%2B+101+%2B+x+ +600+=+423+%2B+x+ +x+=+600+-+423+ +x+=+177+ The lowest score Laura will need in the fifth game is 177

53 percent

78

People also asked

Featured Questions