1-In one sentence, please write what you understand by the term standard deviation.2-Imagine yourself at a fair playing one of the midway games. Pick a game and calculate the expected value and post your results along with how you calculated them. For example, you may decide to throw a basketball to try to win a $10 bear. You paid $2.00 for three shots. What is the expected value? (Please do not use this example in your answer)3-In one sentence, summarize what you understand of the Central Limit Theorem.4-collect a sample of books consisting of the ages of book (based on copyright dates). Plan and describe the sampling procedure, then use the results to construct a confidence interval estimate of the mean age of all books in the library. Please, post and share your results with the class.

Based on your reading and study in the Systems Development Assignment Submission Link. Based on the system that is provided "Split Pay System Specifications" in the Systems Development Exercise Section, you should answer the questions and concerns that are listed below:What systems development model approach would you use to develop this system?Why is the system a good match for the systems development model you chose?What would be the advantage of using your chosen systems development model?What situations might you encounter that would be a problem for the model you chose?What would be your second choice of a systems development model for this system and why?Use the template provided below to record your answers to these questions. Make sure to edit the date, to, from, and subject information. Spell check, grammar check, and proofread your submission. Save your file as a PDF file, and use your"LastName SDLC" as the file name (e.g. "Shehane SDLC.pdf") (remember the file extension .pdf is automatically added).