If you flip a fair coin 4 Times what is the probability it comes up heads every time

Probability on the first flip = 1/2.

On the second flip ... 1/2

On the third flip ... 1/2

On the fourth floor ... 1/2.

On all 4 flips: 1/2 x 1/2 x 1/2 x 1/2 = 1/16.

That's 6.25 %