Answer:
4
Step-by-step explanation:
He should add 4 black blocks because there are a total of 4 other blocks, and in order to have a probability of 50%, the number of black blocks needs to be equal to the total number of the other colored blocks.
Answer:
Step-by-step explanation:
I am sorry but please give detailed question
Answer:
39 (the first option listed among the possible answers)
Step-by-step explanation:
Recall that the mean is the same as the average of the numbers you have listed, that is the addition of all divided by the number of entries you use:
mean = 
Therefore, rounding to the nearest integer, our answer s: 39