The Kurtosis of a Distribution Is Defined as Follows:
A) $\frac { E \left[ \left( Y - \mu _ { \gamma } \right) ^ { 4 } \right] } { \sigma _ { \gamma } ^ { 4 } }$

Multiple Choice

The kurtosis of a distribution is defined as follows:

A) $\frac { E \left[ \left( Y - \mu _ { \gamma } \right) ^ { 4 } \right] } { \sigma _ { \gamma } ^ { 4 } }$
B) $\frac { E \left[ \left( Y ^ { 4 } - \mu _ { y } ^ { 4 } \right) \right] } { \sigma _ { y } ^ { 2 } }$
C) $\frac { \text { skewness } } { \operatorname { vat } ( Y ) }$
D) E[(Y - ${ } ^ { \mu } \gamma$ ⁴)