Ans: The correct answer is 1.25
Calculation:
Ratings (1) | Frequency (2) | Probability of frequency (3) |
(1) * (2) (4) |
(1) - 3.22 (5) |
(5) * (3) |
1 | 7 | 7/50 = 0.14 | 0.14 | 1-3.22 = 4.93 | 4.93*0.14= 0.6902 |
2 | 4 | 4/50 = 0.08 | 0.16 | 2-3.22 = 1.49 | 1.49*0.08= 0.1192 |
3 | 20 | 20/50 = 0.40 | 1.20 | 3-3.22 = 0.05 | 0.05*0.40= 0.02 |
4 | 9 | 9/50 = 0.18 | 0.72 | 4-3.22 = 0.61 | 0.61*0.72= 0.1098 |
5 | 10 | 10/50 = 0.20 | 1 | 5-3.22 = 3.17 | 3.17*0.20= 0.634 |
Total | 50 | 3.22 | 1.5732 |
Standard deviation = √1.5732 = 1.25
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