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Mathematics, 23.10.2019 19:30 shay7298

"the average playing time of compact discs in a large collection is 35 minutes, and the standard deviation is 5 minutes. the following are all true or false?

(a) value 1 standard deviation above mean = 40 min.
(b) value 1 standard deviation below mean = 30 min.
(c) value 2 standard deviations above mean = 45 min.
(d) value 2 standard deviations below mean = 25 min.

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