Table:
text: Caliber
Pounds as a measure of cannon bore
English gun classes c. 1800[ 
 citation needed 
 ]
gun_class_pdr_ shot_diameter_cm shot_volume_cm_3_ approx_service_bore_cm mass_of_projectile_kg
2 6.04 172.76 6.64 0.90846
3 6.91 172.76 7.60 1.36028
4 7.60 230.30 8.37 1.81339
6 8.71 345.39 9.58 2.71957
9 10.00 518.28 11.00 4.08091
12 10.97 691.22 12.07 5.44269
18 12.56 1036.96 13.81 8.16499
24 13.82 1382.65 15.20 10.88696
32 15.21 1843.50 16.73 14.51572
64 19.17 3686.90 21.08 29.03063

Question: How often is the shot volume (cm3) under caliber smaller than 172.76?

Question: What is the average shot volume (cc) if the shot diameter (cm) is less than 6.04 in caliber?