function searchRight( x, r, n, p ) {
	x += 1;
	while ( cdf( x, n, p ) < r ) {
		x += 1;
	}
	return x;
}
Performs a search to the right.

@private
@param {NonNegativeInteger} x - starting guess
@param {Probability} r - probability
@param {NonNegativeInteger} n - number of trials
@param {Probability} p - success probability
@returns {NonNegativeInteger} `r` quantile of the specified distribution