Question

How many heads are expected in 28 tosses of a fair coin?

Answer 1

`14` heads.

Explanation:

As the probability of getting a head on tossing a fair coin is `1/2`, expected value of getting heads in 28 tosses of a fair coin is `28xx1/2=14`.

Additional information `-` In such cases data follows binomial distribution, in which case expected value is `np`, where there are `n` trials and `p` is the probability of getting desired result. The variance of data is `npq`, where `q=1-p`, where `q` is the probability not getting the desired result.