Answer:
Following are the responses to the given points:
Step-by-step explanation:
Given:

Using formula:
For point a:

For point b:

For point c:

For point d:
Hence, the correct choice is "i".
For point e:

Answer:
The standard deviation of the number of runs required is 2447.26
Step-by-step explanation:
For each run, there are only two possible outcomes. Either the program fails, or it does not. The probability of the computer failing during a run is independent of other runs. So we use the binomial probability distribution to solve this question.
Binomial probability distribution
Probability of exactly x sucesses on n repeated trials, with p probability.
The standard deviation for the expected number of trials for r sucesses is:

A computer program has a bug that causes it to fail once in every thousand runs, on average.
This means that 
In an effort to find the bug, independent runs of the program will be made until the program has failed six times. What is the standard deviation of the number of runs required?
This means that r = 6. So

The standard deviation of the number of runs required is 2447.26
Answer:
The answer is C) 4x + 8y +27.
Answer
Now I'm not the best at this so don't go with mine but i'm gonna say
the expression could be n x 3 + 60
Step-by-step explanation:
if n = 4 then multiply 3 x 4 = 12 then 12 + 60 = 72
I don't know sorry i tried
Answer:
the three even integers are -28, -26 and -24.
Step-by-step explanation:
Represent the three numbers as follows:
n
n+2
n+4
Their sum is n + n+2 + n+4 = -78.
Combining the n terms, we get:
3n + 6 = -78, or
3n = -84
Then n = -84/3, or n = -28.
Then the three even integers are -28, -26 and -24.