Eric practiced piano and guitar for a total of 8hours this week. he practiced the piano for 1/4 of that time. how many hours did eric practice the paino this week.

What could explain what happened when the time was equal to 120 minutes

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?

Guys i really need or i have to stay late up night