Lujan, Emmanuel 7

There are n nonfiction books and 12 fiction books on a bookshelf. If one of these books is selected at

random, what is the probability of selecting a nonfiction book, in terms of n?

А

n

12

B

n

n +12

C

12

n

D

12

n +12

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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 statement is true? n is a point of tangency on circle p. pt is a secant of circle p. is a secant of circle p. vu is a tangent of circle p.

Tan198=asin164=? how to solve this? ?