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13 Find the variance and standard deviation for each data set: a 117, 129, 105, 124, 123, 128, 131, 124, 123, 125, 108 b 6.1,

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13 Find the variance and standard deviation for each data set: a 117, 129, 105, 124, 123, 128, 131, 124, 123, 125, 108 b 6.1, 5.6, 7.2, 8.3, 6.6, 8.4, 7.7, 6.2 14 The number of litres of petrol purchased by a random Litres (L) Number of vehicles sample of motor vehicle drivers is shown alongside. 5 For the given data, estimate the: 15

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