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प्रश्न
In the class, weight of students is measured for the class records. Calculate mean weight of the class students using direct method
| Weight in kg | 15 − 25 | 25 − 35 | 35 − 45 | 45 − 55 | 55 − 65 | 65 − 75 |
| No. of students | 4 | 11 | 19 | 14 | 0 | 2 |
बेरीज
उत्तर
| Weight in (kg) |
Mid value (x) |
No. of students (f) |
fx |
| 15 − 25 | 20 | 4 | 80 |
| 25 − 35 | 30 | 11 | 330 |
| 35 − 45 | 40 | 19 | 760 |
| 45 − 55 | 50 | 14 | 700 |
| 55 − 65 | 60 | 0 | 0 |
| 65 − 75 | 70 | 2 | 140 |
| `sumf` = 50 | `sumfx` = 2010 |
Arithmetic mean `bar(x) = (sumfx)/(sumf)`
= `2010/50`
= 40.2
Arithmetic mean = 40.2
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Method of Finding Mean for Grouped Data: Direct Method
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संबंधित प्रश्न
An electric company producing electric bulb, has packed 100 bulbs in each box. Some bulbs from 16 such boxes are tested defective. The information of number of defective bulbs in 16 boxes is given below.
| No. of defective bulbs | No. of boxes |
| 0 – 2 | 3 |
| 2 – 4 | 4 |
| 4 – 6 | 5 |
| 6 – 8 | 3 |
| 8 – 10 | 1 |
- How many boxes contains maximum number of defective bulbs ?
- Find the mean of defective bulbs.
- The box is selected at random. What is the probability that it will contain average 2 to 4 defective bulbs?
- Find the probability of getting highest number of defective bulbs.
