Ineed with questions on 28, 29, 30, 31. thx

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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In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog