Coefficient of Kurtosis β2 = ____________, where μ2 and μ4 are the second and fourth moments about mean

Coefficient of Kurtosis β2 = ____________, where μ2 and μ4 are the second and fourth moments about mean
1). μ2/μ46
2). μ2/μ49
3). μ2/μ41
4). μ2/μ4

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