solve all the parts a,b,c,d using visual studio

Designing and Coding Interface: Create an interface that is user friendlv. Question: Statisticians use the concepts of mean and standard deviation to describe a collection of data. The mean is the average value of the items, and the standard deviation measures the spread or dispersal of the numbers about the mean. Formally, if x1, x2, ..., Xn is a collection of data, then and standard deviation Write a program to calculate the mean and standard deviation of the exam scores, 59, 60, 65, 75, 56, 90, 66, 47, 98, 72, 95, 71, 63, 77 A. assign letter grades to each exam score, namely ES, as follows ES m1.5s ES