You an find the compass next to where you can get all the weapons you can find the telescope after you beat the industrial castle level and you can find the steering wheel at the end of the lavaworld level
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The mean is an average so, just add all the items you are trying to find the mean for and then divide by the number of items. Example 1+2+3= 6/3=2. 2 is the mean
3 items each in 3 categories gives 3*3*3 = 27 possible combinations.
3 items (or people) can line up in 6 different sequences. 6 items (or people) can line up in 720 different sequences.
The cost is: 3*2.55 = 7.65
A yard stick.