[填空题]
The following table showj r ,i8:nttg.ms the total revenue j 016qtrshyv cl15pms ru8/ *4denc2x, y, in US dollars (USD), obtainedobtained monthly during the first six months of 2020, by Law Offr1 0txsuh2 ysv/ p8ce1n*6cj5lr4q mdice of Fox Brothers and the number of clients, x, served.
1.(1)Calculate the Pearson's product-moment correlation coefficient, r, for this data. r =
(2)Hence comment on the result.
2.Write down the equation of the regression line y on x. y =
3.Use the line of the regression to estimate the revenue of serving
20 clients. Give your answer correct to the nearest USD.
Monthly operating cost for the law office is 2500 dollars. Additionally, the cost of serving each client is 200 dollars. y =ax+b a = b =
4.Determine if the law office makes a profit when serving 66 clients on a particularparticular month.
5.(1)Write down an expression for the total revenue of serving x clients. y =ax+b a = b =
(2)Find an expression for the profit of the law office when serving x clients on a particular month. y =ax+b a = b =
(3)Find the least number of clients required to be served to result in a profit for the month.
