22. International Baccalaureate High school students in an International Baccalaureate (IB) must take an exam in each of six subject areas at the end of their junior or senior year. Students are scored on a scale of 1 (poor) to 7 (excellent). During its first year of operation at John W. North High School in Riverside, California, 17 juniors took the IB economics exam, with these results:

Calculate the mean and the standard deviation for these scores.

Transcribed Image Text:

Exam Grade Number of Students 76543 1 4 4 4 3 4