Measurements | 0-10 | 10-20 | 20-30 | 30-40 |
Frequency | 1 | 3 | 4 | 2 |
A) 81
B) 7.6
C) 9
D) 2.26
Correct Answer: C
Solution :
Class | fi | yi | \[d={{y}_{i}}-A\], A = 25 | fidi | fidi2 |
0-10 | 1 | 5 | ? 20 | ? 20 | 400 |
10-20 | 3 | 15 | ? 10 | ? 30 | 300 |
20-30 | 4 | 25 | 0 | 0 | 0 |
30-40 | 2 | 35 | 10 | 20 | 200 |
Total | 10 | ? 30 | 900 |
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