Frequencies and relative frequencies

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Can someone please explain how to find a test statistic given observed frequencies and relative frequencies? Are relative frequencies the same as expected frequencies? I have these two sets of values that correspond to eachother and I'm not sure how to plug in to the equation to get X^2.

(Observed Frequency) Oi:

140

40

20

(Relative Frequency) pi:

.785

.15

.095

Reference no: EM132096118

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