13. Given the following data, calculate the standard deviation of the distribution: 5 and under 10 and under 15 and under 20 and under 25 and under Cost 21.41 E 10 15 20 25 30 10 6 1 Frequency 1 5

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Q: Find the mean of this variable. O 17.50 O 16.80 O 12.20 O 18.95

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Q: YEAR NUMBER OF BLOOD DONATIONS 2012 156,780 2013 156,492 2014 2015 2016 2017 2018 2019 2020 2021…

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A: AmountFrequency14588310241211511162171202425223064055017603751100815032002Total145

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