Why not have a single Collection data type that implements methods to add items, remove the most recently inserted, remove the least recently inserted, remove random, iterate, return the number of items in the collection, and whatever other operations we might desire? Then we could get them all implemented in a single class that could be used by many clients.

Implement Stratified sampling. Given training data, class labels and the fraction of validation data per class 'test_size'. Write a method to sample train data, test data, train labels and test labels such that each class has ‘test_size' fraction of data/labels for validation and 1-test_size fraction of data/labels for training.

Test your Baby class by writing a client program which uses an array to storeinformation about 4 babies. That is, each of the four elements of the arraymust store a Baby object If you have an array for baby names and another array for baby ages,then you have missed the point of the exercise and therefore not metthe requirement of this exercise.   A Baby class object stores the required information about a Baby. Soeach Baby object will have its own relevant information, and thus eachobject must be stored in one element of the array.The client program should:a. Enter details for each baby (name and age) and thus populate theBaby arrayb. Output the details of each baby from the array (name and age)c. Calculate and display the average age of all babies in the arrayd. Determine whether any two babies in the array are the sameAs the required information for these tasks is stored in the Baby array, youwill need to use a loop to access each array element (and use the dot notationto access the…

Consider the class Account (Assume the class is given. do not write the class methods). The Account class has as attributes a holderName (String), balance (double), isChecking(boolean), numberorTransactions (int). Write a method calculate(Account] array) that receives an aray of Account objects as a parameter, and returns the average number af transactions for checking accounts. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).