Use the sample information X=40, o-7, n-13 to calculate a 90 percent confidence interval for u assuming the sample is from a normal population.

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?

Which representation has a constant of variation of -2.5

Find measure angle 1 and measure angle 3 in the kite the diagram is not drawn on the scale