Answer:
-14a^2+6a-7
Step-by-step explanation:
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Answer:
The probablility that there are 8 occurrences in ten minutes is 0.00518 or 0.5%.
Step-by-step explanation:
The distribution that represents the ocurrence of this events is the Poisson distribution.
The probability of having k events in a ten-minute-period can be expressed as:
being λ the mean number of occurrences in ten minutes.
The probablility that there are 8 occurrences in ten minutes can be calculated as:
The probablility that there are 8 occurrences in ten minutes is 0.00518 or 0.5%.
Answer:
100-20=80
need:don't need=20:80=2:8=1:4
ratio is 1:4