In his 21st quiz he scores 0. Therefore his total points remains 160 but now we have to divide by 21. 7 5 1 0 0 7 5 1 0 0 0.
Using the normal average where we calculate the sum and divide it by the number of variables the average score would be 76.
Use the NWEA percentile charts below to better understand your childs latest test score compared with others. On average a good TACHS percentile score ranges from 70 to 99. Average Speed 2xyxY kmph. The weighted average is 828.