Pete has 7 ponies they have a mean height of 116cm pete buys an 8th pony the height of the pony is 128cm, what is the mean of the 8 ponies together?
You can do ((116 x 7) +128 ) / 8 to get the answer. If the average of the 7 is 116, it’s fine to assume all 7 are that height. Chuck that into a calculator (don’t forget the brackets), and you should have an answer 🙂
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