An unbiased die is tossed 6 times. The mean of number odd numbers is

The repeated tosses of a die are Bernoulli trials.

Let X denote the number of success of getting odd numbers in an experiment of 6 trials.

Probability of getting an odd number in a single throw of a die is $p=\frac{3}{6}=\frac{1}{2}$ 

and $\mathrm{q}=1-p=\frac{1}{2}, \mathrm{n}=6$

Now Mean $=\mathrm{nP}=6\left(\frac{1}{2}\right)=3$