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A regulation hockey puck must weigh between 5.5 and 6 ounces. The weights X of pucks...

A regulation hockey puck must weigh between 5.5 and 6 ounces. The weights X of pucks made by a particular process are normally distributed with mean 5.75 ounces and standard deviation 0.11 ounce. Find the probability that a puck made by this process will meet the weight standard.

answer:  = 0.9768 is NOT CORRECT, please I need the correct answer

Math   Statistics-And-Probability   
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Answer:

P(5.5<X<6) = P((5.5-5.75)/0.11<(X-mean)/s<(6-5.75)/0.11)

                  = P(-2.27<Z<2.27)

                  = 0.9770 (Using z score calculator for precision)

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