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Question
Using the information given in the adjoining histogram, calculate the mean.
Sum
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Solution
| C.I. | Frequency | Mid value x | fx |
| 15 – 25 | 10 | 20 | 200 |
| 25 – 35 | 20 | 30 | 600 |
| 35 – 45 | 25 | 40 | 1000 |
| 45 – 55 | 15 | 50 | 750 |
| 55 – 65 | 5 | 60 | 300 |
| Total | 75 | 2850 |
`barx = (sumf_x)/(sumf)`
= `2850/75`
= 38
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