A spinner with 5 equal sections labeled 1-5 is spun 50 times. What is the theoretical probability of spinning an even number? 2: 8
4: 10

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

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?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?