Examlex
Calculate E(X + Y)and Var(X + Y)directly by using the probability distribution of X + Y.
Serrations
Jagged or toothlike edges on objects such as knives or saw blades, enhancing cutting efficiency.
Speculum
A medical tool used to hold open a body cavity or canal for examination purposes.
Retractor
A surgical instrument used to hold back underlying organs and tissues, so that body parts under operation are easily accessible.
Tissue
A collection of similar cells and fibers forming a structure in the body.
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