Mean-20.3+12.5+7.9+17.5+15.6+14.1= 87.6
87.6/6=20.1
Median- 7.6+17.5/2= 12.55
No.
5/16 = 0.3125
1/4 = 0.25
A needle with the length of 5/16 is longer than that of 1/4.
You know that the sum of 12.6, 3.1, and 5.4 is greater than 20. This is because the sum of 12+3+5=20. All of the numbers have added decimals on them, so that at least 1 to the sum of the numbers. The sum without the decimals is at 20, so you know that it must be greater than 20.
