Question 886548
David wants 85% in four tests, or 340/40
So far, he has 82+74+90, or 246 points.
340 - 246 = 94
.
If he scores 94, his scores will be 74, 82, 90, 94
The median is the middle number.  In this case we have TWO middle numbers: 82 and 90.  Add them together and divide by 2 to find the median.
82 + 90 = 172
172 /2 = 86
The mean is 85 (that was a given from earlier)
As for mode, each number occurs only once.  We *could* say that they are all the mode or none the mode.  Grouping is a better solution, though.  There is one value in the 70s, one in the 80s, and two in the 90s, so "90s" would be the mode.