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4. A variable X is normally distributed with m = 60 and S = 13. Calculate,...

4. A variable X is normally distributed with m = 60 and S = 13. Calculate,

a) P(X≥75)

b) P(10<X≤45)

c) P(80<X<90)

d) How many observations have a value with X> 50 if the scope is n = 100?

e)Calculate the limit x of the variable X, of which only 10% of the observations have a larger value.

Math   Statistics-And-Probability   
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