Broo the day and quizlet make a collab i swear everyone will be getting good grades in school and they will get the glizzy special >:)

Ineed asap.i cant understand this question i need someone to me right away

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?

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?