BAEL-4405 move probability examples to java-numbers-4

java-numbers-4/src/main/java/com/baeldung/probability/MaleHeightGenerator.java

@@ -0,0 +1,17 @@
+package com.baeldung.probability;
+
+import org.apache.commons.math3.distribution.NormalDistribution;
+
+public class MaleHeightGenerator {
+    private static final double MEAN_HEIGHT = 176.02;
+    private static final double STANDARD_DEVIATION = 7.11;
+    private static NormalDistribution distribution =  new NormalDistribution(MEAN_HEIGHT, STANDARD_DEVIATION);
+
+    public static double generateNormalHeight() {
+        return distribution.sample();
+    }
+
+    public static double probabilityOfHeightBetween(double heightLowerExclusive, double heightUpperInclusive) {
+        return distribution.probability(heightLowerExclusive, heightUpperInclusive);
+    }
+}

java-numbers-4/src/main/java/com/baeldung/probability/RandomInvoker.java

@@ -0,0 +1,19 @@
+package com.baeldung.probability;
+
+import io.vavr.Lazy;
+
+import java.util.SplittableRandom;
+import java.util.function.Supplier;
+
+public class RandomInvoker {
+    private final Lazy<SplittableRandom> random = Lazy.of(SplittableRandom::new);
+
+    public <T> T withProbability(Supplier<T> supplier1, Supplier<T> supplier2, int probability) {
+        SplittableRandom random = this.random.get();
+        if (random.nextInt(1, 101) <= probability) {
+            return supplier1.get();
+        } else {
+            return supplier2.get();
+        }
+    }
+}