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# (TCO B) According to a survey by the Opinion Research Corporation,

### Resolved Question:

(TCO B) According to a survey by the Opinion Research Corporation, 60% of all clerical workers in the United States “liked their jobs very much.” A random sample of 15 clerical workers is selected. Find the probability that

a. exactly nine of these clerical workers “liked their jobs very much.”
b. at least seven of these clerical workers “liked their jobs very much.”
c. fewer than five of these clerical workers “liked their jobs very much.” (Points : 18)
Submitted: 1 year ago.
Category: Calculus and Above
Expert:  Ryan replied 1 year ago.
Hi,

Do you know if you are expected to determine an exact value using the binomial probability calculation, or if you are supposed to use the normal approximation to the binomial distribution?

Thanks,

Ryan
Customer: replied 1 year ago.
Both
Expert:  Ryan replied 1 year ago.
Hi,

Ok, I'll write up the solution using both methods. I'll have it posted for you as soon as I can.

Thanks,

Ryan
Customer: replied 1 year ago.
Thanks
Expert:  Ryan replied 1 year ago.
Hi again,

Here are the solutions:

Probabilities

Thanks,

Ryan
Ryan, Engineer
Satisfied Customers: 7818
Experience: B.S. in Civil Engineering

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