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The tensile strength in MPa (megapasoals) measured for a random sample of 20' pieces of diecast aluminium is displayed in the following stemandleaf plot: 17

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The tensile strength in MPa (megapasoals) measured for a random sample of 20' pieces of diecast aluminium is displayed in the following stemandleaf plot: 17 007 leaf unit 2 1 18 3 19 47 20 125 21 22 23 23 04448 24 014 25 26 2 The sample mean and standard deviation are: it = 215.05 3 = 27.19225 How many measurements lie above the upper limit of the 90% condence interval for the population mean tensile strength? Select one: 0 a. 4 Ch. 2 0c. 8 0d. 9

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