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MATH / What is the average (mean) of all 5-digit numbers that can be formed by using each of the digits 1, 3, 5, 7, and 8 exactly once?

Problem

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problem

What is the average (mean) of all 55-digit numbers that can be formed by using each of the digits 11, 33, 55, 77, and 88 exactly once?
Plain-text mathematical notation (without MathML)
What is the average (mean) of all 5-digit numbers that can be formed by using each of the digits 1, 3, 5, 7, and 8 exactly once?
Original LaTeX notation
What is the average (mean) of all $5$-digit numbers that can be formed by using each of the digits $1$, $3$, $5$, $7$, and $8$ exactly once?

level

Level 3

type

Intermediate Algebra

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Source and history

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