25 points ans brainliest

the two dot plots below compare the forearm lengths of two groups of schoolchildren:

based on visual inspection of the dot plots, which group appears to have the longest average forearm length?

group a, because seven children have a forearm length longer than 10 inches

group b, because two children have a forearm length longer than 10 inches

group a, because one child in the group has the least forearm length of 9 inches

group b, because three children in the group have the least forearm length of 9 inches

For every corresponding pair of cross sections, the area of the cross section of a sphere with radius r is equal to the area of the cross section of a cylinder with radius and height 2r minus the volume of two cones, each with a radius and height of r. a cross section of the sphere is and a cross section of the cylinder minus the cones, taken parallel to the base of cylinder, is the volume of the cylinder with radius r and height 2r is and the volume of each cone with radius r and height r is 1/3 pie r^3. so the volume of the cylinder minus the two cones is therefore, the volume of the cylinder is 4/3pie r^3 by cavalieri's principle. (fill in options are: r/2- r- 2r- an annulus- a circle -1/3pier^3- 2/3pier^3- 4/3pier^3- 5/3pier^3- 2pier^3- 4pier^3)