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PLS ANSWER- POINTS AND BRAINLIEST

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?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height