The following are Exam scores for a group of Mathematics students.
a) Group this data by using the Sturges’ formula to determine the number of classes. Keep the width of each class equal.
b) Find the mean, standard deviation and variance of the grouped data obtained in (a) above.
No scores shown.
a) What is "Sturges' formula"?
b) Find the mean first = sum of scores/number of scores
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance