math of investment

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Suppose the probability of a coin coming up heads is 2/5. The coin is tossed 4 times (the tosses are independent), and Jane will win \$5 for each head. If all 4 tosses are heads, she will get \$100 extra. She never loses money.
a)what is the probability that Jane will win at least \$5?
b)What is the expected value of her winning?

• math of investment -

Jane will win at least \$5

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