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June 10th, 2015, 03:14 PM   #1
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Joined: Jun 2015
From: Kiribati

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Math Focus: Statistics
Expected Total value

Could anyone check my working out

Two coins are selected t random from a wallet containing four 5 cent pieces, one 10 cent piece, three 20 cent pieces and two 50 cent pieces.
What is the expected total value of the two coins?

expected value = mean = ∑(x).P(x)

But before using the formula you should created your Probability distribution table:

cents 5c 10c 20c 50c Probability distribution table
value of x 4 1 3 2 then X 1 2 3 4
P(x=x) 2/5 1/10 3/10 1/5 P(X=x) 0.1 0.2 0.3 0.4

By using the formula(∑(x).P(x)) all x values are multiplied by its probability and then add them together. = 3

I dont know if I do the right thing because and if I do some mistakes I would like to learn from it.
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June 10th, 2015, 05:21 PM   #2
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Hello, sensational!

Quote:
Two coins are selected a random from a wallet containing four 5-cent
pieces, one 10-cent piece, three 20-cent pieces and two 50-cent pieces.
What is the expected total value of the two coins?







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