Find the expectation of the number of heads in 15 tosses of a coin.

Explanation

Let ` p ` be the probability of getting a head in a single toss.
Then, `p=frac{1}{2}`

Clearly, the distribution of the number of heads is a binomial distribution with `{n}=15, {p}=frac{1}{2}.`

Therefore, Expectation `={E}({X})={np}=15 times frac{1}{2}=7.5`