If μx = 30 and σx = 4, Determine P(X<31) for n = 4. a) What is the mean,μx, of the random variable? b) What is the standard deviation,σx, of the random variable?

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1. If μx = 30 and σx = 4, Determine P(X<31) for n = 4.

a) What is the meanx, of the random variable?

b) What is the standard deviation,σx, of the random variable?

 

**I am mainly confused whether the S.D. for part (b) would be the value that is given (σx = 4) or if it is "σ/√n" (which would be 4/√4 = 2).

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