A focus group of 10 adults was chosen to evaluate the performance of a candidate during a presidential debate. Each member of the group rated the overall performance on a scale of 1 (poor) to 10 (superior). The ratings given the candidate were as follows:

Calculate the
(a) Range,
(b) Inter-quartile range, and
(c) Variance and standard deviation for these rating scores.

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4 5 8 7 9 8 7 3 6 7