use c++ language and don't use a class

Question 3 Write a program that takes its input from a file of numbers of type double. The program outputs to the screen the average and the standard deviation of the numbers in the file. The file contains nothing but numbers of type double separated by blanks and/or line breaks. The standard deviation of a list of numbers ni, n2, n3, and so forth is defined as the square root of the average of the following numbers: (ni - a)2, (n2 - a)2, (n3 - a) 2, and so forth The number a is the average of the numbers ni, n2, n3, and so forth. Hint: Write your program so that it first reads the entire file and computes the average of all the numbers, and then closes the file, then reopens the file and computes the standard deviation. NB: First plan your program on paper (using your computational thinking to do so). You have to submit your plan for your program as well as the actual program code, input and output. Planning your program can take the form of a flowchart, pseudocode, or notes to guide you in the development of the program