The possible x-values of the equation are options C and F. These are the + and - values that make the equation true.
Answer:
0.9898 = 98.98% probability that there will not be more than one failure during a particular week.
Step-by-step explanation:
In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

In which
x is the number of sucesses
e = 2.71828 is the Euler number
is the mean in the given interval.
3 failures every twenty weeks
This means that for 1 week, 
Calculate the probability that there will not be more than one failure during a particular week.
Probability of at most one failure, so:

Then



Then

0.9898 = 98.98% probability that there will not be more than one failure during a particular week.
Answer:
Step-by-step explanation:
-10 and 9
-10×9=-90
-10+9=-1
Y=15 -4y
+4y +4y
5y=15
÷ ÷
5 5
y=3
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