Hi, I'm blocking at this exercise, can someone please help me solve it or explain what needs to be done, thank you!

An appliance company offers insurance for breakage. Insurance costs $ 60 per contract. If the customer cancels their contract, the cost to the company is $ 300 ($ 360 fee - $ 60 received from the customer). According to statistics, the probability that a customer cancels their contract is 0.10. Y represents the company's total gain, when it insures 9 customers who bought new appliances.

Determine the standard deviation of Y.