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machine learning MCQ

What is the mean of the following list of numbers? 4, -12, 10, 4, 10, 2, -11, 23, 12
  • 4.66

(4, -12, 10, 4, 10, 2, -11, 23, 12). Add all the numbers up to get 42, then divide that by the amount of numbers that there are 9, which is 42/9 = 4.66.


Given a bag of marbles with 8 red marbles, 4 blue marbles and 5 green marbles. Removing marbles one at a time from the bag, what is the likelihood of removing 4 marbles without removing a green marble? 
  • 20.8%
First draw - no green, the probability is (8+4)/(8+4+5)=12/17
Two draws - no green, the probability is (12/17)(11/16)
Three draws - no green, the probability is (12/17)(11/16)(10/15)
Four draws - no green, the probability is (12/17)(11/16)(10/15)(9/14), this is the answer 20.8%