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 =

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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 =
 
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Expert Answer

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,

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и 3 пр =10x0.7 = 7

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Step 2

The mean number of errors missed is,

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д %3 пр и %3D10х0.3 =3

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Step 3

The standard deviation of the nu...

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anp(1-p) 10x 0.7 (1-0.7) = 1.4491

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