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What is the common difference in the following arithmetic sequence 7,3,-1,-5

Which of the following answers is 5/25 simplified? 1/5 5/5 2/5 1/25

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