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Probability

Dotties Tax Service specializes in federal tax returns for professional clients, such as physicians, dentists, accountants, and lawyers. A recent audit by the IRS of the returns she prepared indicated that an error was made on 15 percent of the returns she prepared last year. Assuming this rate continues into this year and she prepares 63 returns. What is the probability that she makes errors on:

(a) More than 6 returns?
(b) At least 6 returns?
(c) Exactly 6 returns?

Ans:
a) 0.0192
b) 0.0694
c) 0.0502

Solution Preview

(As requested in the question, I have used normal distribution to solve all parts of this problem)

p = 0.15, q = 1 - ...

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