Since it went 8 floors in 6 seconds you divide. 8/6 is 1.333 or 1 1/3 floors per second. Hope this helps.
108+103+98+105+85+112+119+82+94+115+126+89 = 1236
1236÷12 =103
Let me think this through again and I will come back to you! 2.22 graph
The probability of the black marble will be 35.7% because 100/(9+5) is 7.14 and you multiply that by 5 to get 35.7%.