Suppose you have a data set that includes the values 20,30, and 50. If you add a fourth value to this data set and after doing that the mean of the data set is 50
what was the value that you added?
A.-20
8.40
C. 50
D.100
I need help please someone help

The correlation coefficient between the number of students and marks obtained in end semester exam. (13 marks) give the statistical meaning of the relationship between the number of students and marks b. obtained in end semester exam. (3 marks) draw the number of students and marks obtained in end semester exam scatter diagram c. (4 marks) check list write your name and id corectly write the question number properly use your own calculator. show all the steps to solve the problems. use the correct formula. answer in provided time. don't use your mobile for any purpose. write your answer up to two decimal places