Suppose that the number of customers entering a department store in a day is a random variable with mean of 21 customers/day. suppose that the amount of money spent by each one of these customers is a random variable is governed by the following probability: with probability 1/5 a customer spends $20, with probability 2/5 a customer spends $10, with probability 2/5 a customer spends $5. the amounts spent by different customers are statistically independent. also assume that the amount spent by each customer is independent of the number of customers to enter the store. calculate the average cumulative amount spent by all customers that visit the store in a day.

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

answer: sensy

step-by-step explanation:

step-by-step explanation: