its simple really the lobster will molt 4 times every year so take 12 times 4 to get 48. to get how many times a lobster molts in one year divide 20 by 5 to get 4
hope this helps :)
You would add them all together and then divide the answer by how many numbers are there in this case there are 6 so you would all all 6 numbers then divide by 6
So all the numbers added together is 12 so then divide 12 and 6
the mean would be 6