A small store keeps track of the number X of customers that make a purchase during the first hour that the store is open each day. Based on the records, X has the following probability distribution. 0 1 2 3 4 f(x) 0.1 0.1 0.1 0.1 0.6 The standard deviation of the number of customers that make a purchase during the first hour that the store is open is

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A small store keeps track of the number X of customers that make a purchase during the first hour that the store is
open each day. Based on the records, X has the following probability distribution.
1
2 3 4
f(x) 0.1 0.1 o.1 0.1 0.6
The standard deviation of the number of customers that make a purchase during the first hour that the store is
open is
(А) з
(В) 2
c) 1.4
D) 0.2
Transcribed Image Text:A small store keeps track of the number X of customers that make a purchase during the first hour that the store is open each day. Based on the records, X has the following probability distribution. 1 2 3 4 f(x) 0.1 0.1 o.1 0.1 0.6 The standard deviation of the number of customers that make a purchase during the first hour that the store is open is (А) з (В) 2 c) 1.4 D) 0.2
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