SOLUTION: I'm having a hard time understanding how to compute this question. I'm just starting my summer school class and my teacher is absolutely HORRID! It's his first time ever teaching a

Question 878493: I'm having a hard time understanding how to compute this question. I'm just starting my summer school class and my teacher is absolutely HORRID! It's his first time ever teaching and he doesn't speak english well!
My question is how do I solve this question?
Question:
Mike's Resume shop specializes in creating resumes for students. A recent survey of Mike's shop revealed that a spelling error was made on 10% of the resumes last year. Calculate the probabilities that a certain number of resumes have spelling errors assuming this rate continues into this year and they prepare 2954 resumes.
For full marks your answer should be accurate to at least four decimal places.
a) More than 296 resumes.
Probability:

b) At least 296 resumes.
Probability:

c) Exactly 296 resumes.
Probability:

Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!

This is a binomial probability problem. Where there are 

n = 2954 trials (resumes)
p = 10% = .1 = the probability that if you picked just 1 resume it would have
 spelling errors.
q = 100%-10% = 1-.1 = .9 = the probability that if you picked just 1 resume it
would not have any spelling errors.

r = 296 = the number of "successful" cases you want the probability of.

Watch this video https://www.youtube.com/watch?v=P3ZpHlzWnMs
and use your numbers instead.

Correction factor:
you will use 296.5 for (a) since it WILL NOT include 296

You will use 295.5 for (b) since it WILL include 296

For (c) just subtract the answer for (a) from the answer to (b) 

Watch some more of those videos on youtube. And you can ask me
any questions you have in the thank you note and I'll be glad to
answer by email.  No charge.  I do this as a hobby. 

Edwin

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