11999 junior high school mathematics network - Training Enrollment Network

11999 junior high school mathematics network

This is the expectation in probability

Let x be the number of gains or losses.

x=9 P= 1/2 1

x=4 P= 1/2 1

x=- 1 P= 19/2 1

e(x)= 9/2 1+4/2 1- 19/2 1 =-6/2 1 =-2/7

Average loss -2/7 yuan.

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