Randall recorded 8 songs on his most recent cd. the total of the cd is 49 minutes. find a unit rate of represent the average long per song on the cd

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?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Jermaine has t subway tokens. karen has 4 more subway tokens than jermaine. raul has 5 fewer subway tokens than jermaine. which expression represents the ratio of karen's tokens to raul's tokens