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प्रश्न
80 bulbs are selected at random from a lot and their life time (in hrs) is recorded in the form of a frequency table given below:
| Life time (in hours) | 300 | 500 | 700 | 900 | 1100 |
| Frequency | 10 | 12 | 23 | 25 | 10 |
One bulb is selected at random from the lot. The probability that its life is 1150 hours, is
पर्याय
`1/80`
`7/16`
0
1
उत्तर
0
Explanation:
Total bulb in a lot, n(S) = 80
Number of bulbs whose life time is 1150, n(E) = 0
Probability that its life time is 1150 h = `(n(E))/(n(S)) = 0/80 = 0`
Hence, the probability that its life time is 1150 is 0.
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संबंधित प्रश्न
An organization selected 2400 families at random and surveyed them to determine a relationship between income level and the number of vehicles in a family. The information gathered is listed in the table below:-
|
Monthly income (in Rs.) |
Vehicles per family | |||
| 0 | 1 | 2 | Above 2 | |
| Less than 7000 | 10 | 160 | 25 | 0 |
| 7000 – 10000 | 0 | 305 | 27 | 2 |
| 10000 – 13000 | 1 | 535 | 29 | 1 |
| 13000 – 16000 | 2 | 469 | 59 | 25 |
| 16000 or more | 1 | 579 | 82 | 88 |
Suppose a family is chosen, find the probability that the family chosen is
(i) earning Rs 10000 − 13000 per month and owning exactly 2 vehicles.
(ii) earning Rs 16000 or more per month and owning exactly 1 vehicle.
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(iv) earning Rs 13000 − 16000 per month and owning more than 2 vehicles.
(v) owning not more than 1 vehicle.
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| Opinion | Number of students |
| like | 135 |
| dislike | 65 |
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(i) likes statistics, (ii) does not like it
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Two heads: 95 times
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