Find the value of 45 - 0.023

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?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?