. "105668569"@en-us . "first moment"@en-us . . . . . . "arithmetic mean"@en-us . . . "106024230"^^ . . "expected value"@en-us . . . . . "arithmetic mean"^^ . . "0"^^ . . . . "0"^^ . "the sum of the values of a random variable divided by the number of values"@en-us . "expectation"@en-us . "06024230-n"^^ . .