Question

A spinner is divided into 8 equal sections what is probability of spinning 1 or any odd number??

Answer 1

Probability of spinning "1":

$$P = \frac {n}{m}$$

$m = 8$ (there are 8 equal sections),

$n = 1$ (there are only one section for "1")

$$P = \frac {1}{8} = 0.125$$

Probability of spinning any odd number:

$$P = \frac {n}{m}$$

$m = 8$ (there are 8 equal sections),

$n = 4$ (odd numbers are: 1, 3, 5, 7)

$$P = \frac {4}{8} = 0.5$$