Hello, First of all, you have to order the number from least to greatest: 7,6,12,19,6,13,16,20,9
6,6,7,9,12,13,16,19,20
We see that there are total 9 numbers. Median means that the middle number, so we separate 4 numbers into two groups 6,6,7,9 13,16,19,20. Now,we see that there is only one number which is 12. As a result, the median is 12. Hope it help!
To find the volume of a dome, you would have to find the volume of the sphere, theoretically, and then divide it by two. To calculate the volume, we would use the formula 4/3 . The radius (r) in this case is half of the diameter which is 14. 4 x 3.14 (pi) = 12.56. 12.56 x 14 x 14 x 14 (2744) = 34464.64. If we divide this number by 3, we get 11488.2133. If we divide this by 2 (to get the dome), we get 5744.10656. Which would be 5744.1 rounded to the nearest tenth.