Class to get a weighted random number

WeightedRandom.cs

using UnityEngine;

namespace NG
{
    /// <summary>
    /// Gets a weighted random number
    /// Usage
    /// float y = WeightedRandom.GetRandomValue(
    ///                 new WeightedRandom.RandomSelection(100f, 80f , 0.20f),
    ///                 new WeightedRandom.RandomSelection(80f, 60f, 0.40f),
    ///                 new WeightedRandom.RandomSelection(60f , 30f, 0.30f),
    ///                 new WeightedRandom.RandomSelection(30f , 0f , 0.10f)
    /// );
    /// </summary>
    public class WeightedRandom
    {
        public static float GetRandomValue(params RandomSelection[] selections)
        {
            float rand = Random.value;
            float currentProb = 0;
            for (int i = 0; i < selections.Length; i++)
            {
                currentProb += selections[i].probability;
                if (rand <= currentProb)
                    return selections[i].GetValue();
            }

            //will happen if the input's probabilities sums to less than 1
            //throw error here if that's appropriate
            return -1;
        }

        public struct RandomSelection
        {
            private float minValue;
            private float maxValue;
            public float probability;

            public RandomSelection(float minValue, float maxValue, float probability)
            {
                this.minValue = minValue;
                this.maxValue = maxValue;
                this.probability = probability;
            }

            public float GetValue() { return Random.Range(minValue, maxValue + 1f); }
        }
    }
}