Solved: What percentage of data lies in the interval mu plusmn, Basic Statistics

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What percentage of data lies in the interval mu plusmn

1) The scores in Mathematics of 15 students are given below. Find range, sample variance and standard deviation.
93 85 78 79 97 90 82 61 53 63 94 69 84 67 95

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2) The following are the prices charged (in cents) for a can of chicken soup at 20 super markets.
80 89 81 78 92 82 79 85 79 85 91 80 81 84 90 79 79 78 92 84

a) Calculate the mean and standard deviation.

b) What percentage of data lies in the interval μ ± σ ? In the interval μ ± 2σ ?

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Basic Statistics: What percentage of data lies in the interval mu plusmn

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