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Task 4: Write a function that takes an array of doubles and returns the index of the largest value and the index of the smallest value 1. Write the header 2. Write sample calls and expected result for each to test your function 3. Write the body of the function 4. Test your function in XCode Playground Task 5: Write a function that takes an array of doubles and returns their arithmetic mean 1. Write the header 2. Write sample calls and expected result for each to test your function 3. Write the body of the function 4. Test your function in XCode Playground Task 6: Write a function that takes an array of doubles and returns the index of the median value. 1. Write the header 2. Write sample calls and expected result for each to test your function 3. Write the body of the function 4. Test your function in XCode Playground