A sample of six university students responded to the question "How much time, in minutes, did you spend on the social network site yesterday?" One student never used the site and was dropped from the study.

Calculate, using these five values,
(a) The sample variance using the alternative formula.
(b) The sample standard deviation.
(c) Including a sixth value 0 for the student who never uses the site, recalculate the sample standard deviation. Comment on the change in value.

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