Problem solving - calculate the expected value, variance, and standard deviation

Question

You play a game of tossing an unbiased coin. If a head appears on each toss, you win ¥60. However, if a tail appears you lose ¥70. If you continue to play the game, how much do you expect to win or lose in the game?

Answer 1

The number of tosses is not given.

Therefore I assume it is unlimited.

Therefore you can expect to lose Y10 for every two tosses.