Question

Asked Oct 26, 2019

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Typing errors in a text are either nonword errors (as when "the" is typed as "teh") or word errors that result in a real but incorrect word. Spell‑checking software will catch nonword errors but not word errors. Human proofreaders catch 70% of word errors.

You ask a fellow student to proofread an essay in which you have deliberately made 10 word errors.

What is the mean number of errors caught? (Enter your answer as a whole number.)

mean of errors caught =

What is the mean number of errors missed? (Enter your answer as a whole number.)

mean of errors missed =

(c) What is the standard deviation of the number of errors caught? (Enter your answer rounded to four decimal places.)

standard deviation of the number of errors caught =

What is the standard deviation of the number of errors missed? (Enter your answer rounded to four decimal places.)

standard deviation of the number of errors missed =

Step 1

The sample size, *n* is provided as 10. The probability of error caught is 0.7. Therefore, the probability of errors missed = 1 – probability of error caught = 1 – 0.7 = 0.3.

The mean number of errors caught is,

Step 2

The mean number of errors missed is,

Step 3

The standard deviation of the nu...

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