Katie has 8 black marbles, 12 clear marbles, and 10 blue marbles in a bag. if she picks one at random, what is the probability that she will pick a black marble? (enter your answer as a fraction in its reduced form.)

2-digit numbers less than 91 which are 1 less than a multiple of 10

Which of the following of the following sets of side lengths could not form a triangle?

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3