A student took 5 tests this marking period and had a mean score of 90. Her scores on the first 4 tests were 90, 96, 86, and 92. What was her score on the fifth test?
First you have to find out the pattern which is +6 and -10, 90+6=96, 96-10, 86 and 86+6=92, so the score of the fifth test will be 82, because the pattern will be -10 after +6
