3. It has been found in the past that 4 pe na certain factory are defective. A sample of ten is drawn om each hour's production and the number of defective: what fraction of these hourly samples would there be a

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3. It has been found in the past that 4 per cent of the screws produced
in a certain factory are defective. A sample of ten is drawn randomly
from each hour's production and the number of defectives is noted.
In what fraction of these hourly samples would there be at least two
defectives? What doubts would you have if a particular sample con-
at
tained six defectives?
Transcribed Image Text:3. It has been found in the past that 4 per cent of the screws produced in a certain factory are defective. A sample of ten is drawn randomly from each hour's production and the number of defectives is noted. In what fraction of these hourly samples would there be at least two defectives? What doubts would you have if a particular sample con- at tained six defectives?
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