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The grades from a statistics class for the ?rst test are given by

xi

96

87

65

49

77

74

99

68

56

84

p (xi)

3/15

2/15

1/15

1/15

2/15

1/15

1/15

1/15

1/15

2/15

(a) Find mean μ and variance σ2.

(b) Find the mgf.

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