The times of the runners in a marathon are normally distributed, with a mean of 3 hours and 50 minutes and a standard deviation of 30 minute. what is the probability that a randomly selected runner has a time less than or equal to 3 hours and 20 minutes?

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9

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

Item 1 solve for s. s+24=90 −114 −66 66 114