In the sample of 100 the is a 10% chance for each citizen that they areOriginally Posted bybombo31

in favour on increased aid, so the number in favour in the sample of 100

has a binomial distribution with single case probability of a favourable outcome

equal to .

For a sample of size N the mean number of successes is:

,

and the standard deviation is:

.

So now just plug and into

these equations to find the answerers.

RonL