In Ms. Sander’s class, 1/6 of the students received A’s and 2/6 of the students received B’s. What fraction of the students received either A’s or B’s?

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?

Ahiking trail is 6 miles long. it has 4 exercise stations, spaced evenly along the trail. what is the distance between each exercise station?

Sketch one cycle if the cosine function y=2cos2theta