Posted by **Joe** on Sunday, March 8, 2009 at 11:42am.

Sally took four tests in science class. On each successive test, her score improved by 3 points. If her mean score was 69.5%, what did she score on the first test?

- college algebra -
**Hannah Xx**, Sunday, March 8, 2009 at 11:47am
66.5%

- college algebra -
**Joe**, Sunday, March 8, 2009 at 12:08pm
thanks for the answer but can you please show how you got that answer

- college algebra -
**mark**, Sunday, March 8, 2009 at 12:36pm
the tests improve by 3 points, therefore:

test 1 x

test 2 x+3

test 3 x+6

test 4 x+9

the mean is the sum of the test scores divided by the number of tests. also, we know the mean = 69.5%

therefore, we get the equation:

(4x+18)/4 = 69.5%

4x+18 = 278

4x = 260

x = 65

therefore the score on the first test was 65%

## Answer this Question

## Related Questions

- social science statistics - a professor was curious to whether the students in a...
- algebra - Briana's second test score was 8 points higher than her first score. ...
- graduate statistics - A nursing professor was curious as to whether the students...
- math - Adam took five tests and received a grade for each of them. The first ...
- algebra - Jacob has a mean score of 78 after his first four math tests. He wants...
- math - A teacher allows the students to each "throw out" their lowest test score...
- Algebra - Tom took five math tests and got an integer score on each of them. He ...
- Algebra - Tom took five math tests and got an integer score on each of them. He ...
- algebra - sasha needs to score at least 360 points on 4 tests to earn an A. on ...
- Statistics - In your biology class, your final grade is based on several things...

More Related Questions