SOLUTION: mean is 60 and the standard deviation is 4.. Find the proability that X is less than 55.

Algebra ->  Probability-and-statistics -> SOLUTION: mean is 60 and the standard deviation is 4.. Find the proability that X is less than 55.      Log On


   

Question 460526: mean is 60 and the standard deviation is 4.. Find the proability that X is less than 55.
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
z=(55-60)/4
=-5/4=-1.25
Area under the normal curve below -1.25 standard deviations is .106= probability that x is less than 55.
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Ed