Q4) In a statistics course, there are five examinations. A student receives scores of 83, 85, 80, and 81 on the first four exams. What score must the student get on the fifth exam in order to have a mean average of 80 for the five exams? Explain your answer.© BrainMass Inc. brainmass.com June 3, 2020, 10:31 pm ad1c9bdddf
Let x be the required score, since the average for the five exams is 80,
Thus (83+85+80+81+x)/5 = 80
83+85+80+81+x = 80*5 =400
X = 400-(83+85+50+81)=71
The solution provides step by step method for the calculation of mean score based on a restriction . Formula for the calculation and Interpretations of the results are also included.