This document contains an assignment for a quantitative analysis course. It includes 3 quantitative problems: 1) calculating mean, median and mode from production data; 2) determining probabilities of customer dissatisfaction factors and reasons for leaving; 3) finding the lowest income among the richest 250 people from a normal distribution. It also includes short notes on 4 topics: a) test of goodness of fit, b) critical region of a test, and c) exponential smoothing method.