Q1) All Seasons plumbing has two service trucks that frequently break down. If probability the first truck is available is= .75, probability the second truck is available is= .50, and probability both are available is= .30, determine the probability which neither truck is available?

Q2) A study by National Park Service revealed which 50 percent of vacationers going to Rocky Mountain region visit Yellowstone Park, 40% visit the Tetons, and 35 percent visit both. Determine the probability of vacationer visiting Yellow stone Park or the Tetons? 

3) Merta claims that 74% of its trains are on time.  

a) Determine the probability that among the 60 trains, 38 or fewer arrived on time.   

b) Determine the probability that among 60 trains, 50 or more arrived on time.