How do you model a math problem such as 0.3x0.4

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

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[tex]5 \times1 \frac{12}{13} [/tex] me