Solve this:

Dear student,

Refer to the following link for question 1 (i) part
https://www.meritnation.com/ask-answer/question/find-the-arithmetic-mean-of-the-square-of-first-five-natural/statistics/6947762
similarly you can do for (ii) part where the first four cubes are 1, 8, 27, 64

Refer to the following link for question 3
https://www.meritnation.com/ask-answer/question/if-the-probability-of-a-winning-a-game-is-0-4-what-is-the-p/probability/9061183

Regards