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can you please try to help me understand this?

Q:The table below shows a distribution and the observed frequencies of the values of a variable from a simple random sample of a population. Perform a chi-square goodness-of-fit test, at the specified significance level, to decide whether the distribution of the variable differs from the given distribution.

Distribution: 0.2 0.2 0.1 0.2 0.3
Observed freq: 37 15 12 23 43
significance level=0.05

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