What must be true in order for p (a or b) - p(a) + p(b)? a. a and b cannot be disjoint. b. a and b must be independent. c. a and b cannot be independent. d. a and b must be disjoint. e. it is always true.

Which expression is equivalent to sq-80

Find the value of x that will make l ll m

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.