What does
-$20 -$15 +$30 $2
Equal

An equation where variables are used to represent known values—function notation true or false

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?

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth