At α = 0.05, test the claim that the 400 test scores shown in the frequency distribution are normally distributed.
(a) Find the expected frequencies,
(b) Find the critical value and identify the rejection region,
(c) Find the chi-square test statistic,
(d) Decide whether to reject or fail to reject the null hypothesis,
(e) Interpret the decision in the context of the original claim. |

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