4=y-4 solve for the variable

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 is an example of conditional probability

When steve woke up. his temperature was 102 degrees f. two hours later it was 3 degrees lower. what was his temperature then?