question archive A random sample of magnesium concentrations (in parts per million, or ppm) in ground water from various locations follows

A random sample of magnesium concentrations (in parts per million, or ppm) in ground water from various locations follows

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A random sample of magnesium concentrations (in parts per million, or ppm) in ground water from various locations follows. Estimate the mean concentration of magnesium in ppm with 90% confidence. Assume  .

40

83

69

64

117

77

55

96

23

106

26

59

122

20

90

103

68

15

63

117

69

8

89

53

6

113

120

72

40

54

77

46

108

74

93

 

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