For each situation, make a tree diagram to show the sample space. Then give the total number of outcomes. choosing a silver, black, or red CD player and choosing a rock, country, or rap CD
a. 3
c. 9
b. 6
d. 12

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.