Answer Happy

Please help to solve this probability problem. The numbers on
the line (excluding the question numbers like 1. 2. 3.) are the
final correct answers (for this question, the correct answers are
3.77, 0.19 and 55.77 respectively). Please give detailed steps
to explain how to get the final correct answer. Thanks!
5. Fill in the blanks Every time a coupon is being collected, the coupon is equally likely to be any of 4 different colours, independent of the coupons previously collected. We have collected 10 coupons. The random variable Y denotes the number of colours among the coupons we have. E[Y] = 1.3.77 (2 decimal places) Var(Y) = 2. 0.19 (2 decimal places) E[Y]] = 3. 55.77 (2 decimal places) =