A Fabella Is a Small Bone in the Knee Found

question 6

Essay

A fabella is a small bone in the knee found in a tendon behind the femur in some species of mammals, including humans. Historically, it has been rare, but recently it has become more common. Probability data for birth year and presence or absence of the bone is presented in the table. Imagine we examined 200 skeletons of individuals born in 1900 and 100 skeletons of individuals born in 2000. Draw a mosaic plot depicting the probabilities of a random individual from our study having or not having a fabella in their skeleton.
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Probability that skeleton will have a fabella.

$\begin{array}{lc}\text { Birth year and } \\\text { fabella status } & \text { Probability } \\\hline 1900, \text { absent } & 0.80 \\1900, \text { present } & 0.20 \\2000 \text {, absent } & 0.60 \\2000, \text { present } & 0.40\end{array}$ ​

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