Simplify: 2−2/3−41/2−1/6

Which of the following answers is 5/25 simplified? 1/5 5/5 2/5 1/25

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?

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41