A fair 4 sided die has the numbers 123 and 4 on its faces

A fair 4 sided die has the numbers 1,2,3 and 4 on its faces. The die is rolled 20 times. The random variable X represents the number of 4s obtained.

a) Find the mean and variance of X

b) Find P(x<µ-?)

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A fair 4 sided die has the numbers 123 and 4 on its faces : a fair 4 sided die has the numbers 123 and 4 on its faces. the die is rolled 20 times. the random variable x represents

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