An urn contains n balls numbered 1, 2, . . . , n. We remove k balls at random (without replacement) and add up their numbers. Find the mean and variance of the total.

its 4 because 2 times 2 is 4, if you double the number two you get four

25 questions , because they start with 100.  

350-100=250 .  

. 250/10=25

step-by-step explanation:

first take off 100, then what x 10 = 250? that is your answer. (25)