Suppose a fair coin is tossed five times and let x be the number that turned up in those five times.

Question

**the mean and the standard deviation are respectively...
a.) 0.5, 0.5
b.) 2.5, 0.5
c.) 2.5, 2.24
d.) 2.5, 1.12

**find P(x≥1)
a.) 0.5
b.) 1.0
c.) 0.03
d.) 0.97

* i just don't get how i can do the problem not given any of the x values