Answer:
a, c, & d
Step-by-step explanation:
Answer:
32.33% probability of having at least 3 erros in an hour.
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 time interval.
The mean number of errors is 2 per hour.
This means that 
(a) What is the probability of having at least 3 errors in an hour?
Either you have 2 or less errors in an hour, or we have at least 3 errors. The sum of the probabilities of these events is decimal 1. So

We want 
So

In which







32.33% probability of having at least 3 erros in an hour.
The answer is 45 because on the bottom there is a 105 and since the 30 degrees is equal with the one across from it you do 180-105-30 or 105+30 then 180-135
1223397292647926181926392726.5 because that is the answer