Use the frequency distribution table below showing a sample data set for 10 students on a test with a maximum score of 20 to answer questions 8 and 9:
Score Frequency Midpoint Midpoint x Frequency Midpoint squared x Frequency
1 - 5 4
6 - 10 3
11 - 15 2
16 - 20 1
Totals
2. Find the mean score, X , of the data in the frequency distribution above.
3. Find the standard deviation of the scores in the frequency distribution above.