Just solve it, I can do the graphing and checking. Just solve it please and thank you very much! I will be giving brainliest to the correct or best answer.

What is the mean of the data set 125, 141, 213, 155, 281

Im so bad at fractions they are not my best math thing to work on

Brittany has designed four different birdcages, each with the same volume: a square pyramid, a cylinder, a cone, and a sphere. the zoo wants to use one of brittany’s designs but plans to change the volume of the cage. find the design change that would result in the birdcage with the greatest volume. a.) increase the area of the base of the square pyramid by a factor of ten. b.) increase the height of the cylinder by a factor of ten. c.) increase the radius of the cone by a factor of ten. d.) increase the radius of a sphere by a factor of ten.