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Is fulfilled:

With probability 0.7 the student is not a fan of the Lakers

With probability 0.29 the student is a fan of the Lakers and speaks English

With probability 0.21 the student speaks English but is not a fan of the Lakers

Let N be the random variable indicating the student note. Calculate the density of N.

Can anyone help me? How/Where should I start doing this exercises? What does density mean?