What is the chance that for 30 random spins, 29 will be up?

Formula for Probability is:

P (n) = N! / (n! (N-n) ! p^n q^ (N-n)

where,

p is the probability of getting one outcome=1/2

and

q=probability of getting the other outcome=1/2

Putting the values in the equation:

P (29) = 30! / (1! 29!) (1/2) ^30

P (29) = 30 x (1/2) ^30 = 2.8x10^ (-8)

In percentage:0.0000028%

1/2 I believe because you either have up or down either that or its 29/30 but i really do believe its 1/2