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22. Find the arithmetic mean of the followingClass Interval 10-25 25-40 40-55 55-70 70-85 85 100Number of students | 2 | 3 | 7 6 6 6 |
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Answer» CI. f. x. xf10-25. 2. 17.5. 35.025-40. 3. 32.5. 97.540-55. 7. 47.5. 332.555-70. 6. 62.5. 375.070-85. 6. 77.5. 465.085-100. 6. 92.5. 463.0 summation of xf =1768summation of f = 30mean = 1768/30=58.9 |
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