Yasmin has 5 coins. One of these coins is biased with P(heads) = 0.6. The other 4 coins are fair. She tosses all 5 coins once and records the number of heads, X

I have just added powers directly. You know rules of exponents.

May 17th, 2015

it is not 0.53 and 0.54. it is 0.5 raised to the power 3 and 0.5 raised to the power 4.

May 17th, 2015

are you getting it?

May 17th, 2015

I followed by taking 0.5^4 common and other solution is following by without taking common. It is just like taking two different roots to same destination.