Un conjunto de 10 000 observaciones tiene una distribución normal con media de 450. Si 1700 de ellas están comprendidas entre 450 y 460. ¿Cuál es la desviación
estándar?

If the measure of xyz is 81 what is the measure of yz

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

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?