/**
 * Generates a random number based on mean and sd (normal distribution)
 *
 * @param {number} mean
 * - Mean for normal distribution
 *
 * @param {number} sd
 * - Standard deviation for normal distribution
 *
 * @return {number}
 * A random number base on normal distribution
 *
 * @example
 * randomND(3, 1)  // might return 3.5
 * randomND(3.2, 0)  // might return 3.2
 */
export default function randomND(mean: number, sd: number): number;