He is not correct, any number 5 or greater rounds the number up.
The speed of the dragonfly would be 7 because 7 rounds 9 to 10 making 6 a 7.
Ask your teacher not us. thanks management. :)
The mean can be revealed by looking at the ranges of numbers. You need exact numbers to find a mean.
Median is just to middle. Hopefully you can find the middle bar.
V = L * W * H
V = 3 * 5 * 6
V = 90 cubic units