A stock is currently trading at $4. Tomorrow there is a 30% chance it will trade at $6 and a 70% chance it will trade at $3. The risk free rate of return is r = 0.

a) What is the expected value of the stock?

b) What is the variance of the stock?

c) What is the expected value of a straddle that expires tomorrow (Exercise Price = $4) on the stock?

d) What is the value of the straddle?

I need help with parts c and d please.