What is wrong with the following equation: 4 + (10 / 5) = 6 - 2

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?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

(x-5)1/2+5=2 what is possible solution of this equation