<span>The difference is where the material came from. Spoils come from overburden and is discarded as waste, whereas, tailings come from left over dredging of steam beds that are discarded as waste as well. </span>
Atleast 3 Heads in 10 Coin Tosses
0.95 is the probability of getting 3 Heads in 10 tosses.
I Believe 3, Is Correct...If That Helps Any