What do you get if you cross a chicken with a cow? What's the most musical part of a chicken? Which side of a chicken has the most feathers? What do you get if you cross a cocker spaniel, a poodle and a rooster?Ĭhickens rise when the rooster crows, but when do ducks get up? What do you call it when it rains chickens and ducks? Where do you find a chicken with no legs? What do you get when a chicken lays an egg on top of a barn?Ī rooster laid an egg on a barn roof. Pick a topic and read all the hilarious, corny jokes you'll ever need. Today's featured page: Pumpkin Shape Book to Print Hen and Egg Joke: Divide, Then Decode: Arithmetic Worksheet There are (relatively) simple formulas for is a user-supported site.Īs a bonus, site members have access to a banner-ad-free version of the site, with print-friendly pages. Let's calculate the Mean, Variance and Standard Deviation for the Sports Bike inspections. Summary: "for the 4 next bikes, there is a tiny 0.01% chance of no passes, 0.36% chance of 1 pass, 5% chance of 2 passes, 29% chance of 3 passes, and a whopping 66% chance they all pass the inspection." Mean, Variance and Standard Deviation X is the Random Variable "Number of passes from four inspections". What is the expected Mean and Variance of the 4 next inspections?įirst, let's calculate all probabilities. 90% pass final inspection (and 10% fail and need to be fixed). Summary: "for the 4 throws, there is a 48% chance of no twos, 39% chance of 1 two, 12% chance of 2 twos, 1.5% chance of 3 twos, and a tiny 0.08% chance of all throws being a two (but it still could happen!)" X is the Random Variable ‘Number of Twos from four throws’. Note: it is often called "n choose k" and you can learn more here.Ī fair die is thrown four times. The formula may look scary but is easy to use. Well, they are actually in Pascal’s Triangle ! In our previous example, how can we get the values 1, 3, 3 and 1 ? Now imagine we want the chances of 5 heads in 9 tosses: to list all 512 outcomes will take a long time! We can write this in terms of a Random Variable "X" = "The number of Heads from 3 tosses of a coin":Īnd this is what it looks like as a graph: The calculations are (P means "Probability of"):
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