## Set $$X = \{a, b, c, d, 9\},$$ where $$a, b, c, d$$ and $$9$$ are five distinct positive integers. If $$9$$ is the only

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### Set $$X = \{a, b, c, d, 9\},$$ where $$a, b, c, d$$ and $$9$$ are five distinct positive integers. If $$9$$ is the only

by M7MBA » Thu Jan 13, 2022 12:28 pm

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## Global Stats

Set $$X = \{a, b, c, d, 9\},$$ where $$a, b, c, d$$ and $$9$$ are five distinct positive integers. If $$9$$ is the only odd integer in the set, what is the average (arithmetic mean) of set $$X?$$

(1) The standard deviation of set $$X$$ is $$2.$$
(2) The range of $$\{a, b, c\}$$ is $$4$$ and the average (arithmetic mean) of $$\{a, b, c\}$$ is $$10.$$