4.103 Spell-checking software.
Spell-checking software catches “nonword errors,” which are strings of letters that are not words, as when “the” is typed as “eth.” When undergraduates are asked to write a 250-word essay (without spell-checking), the number of nonword errors has the following distribution:
Value of | 0 | 1 | 2 | 3 | 4 |
Probability | 0.1 | 0.3 | 0.3 | 0.2 | 0.1 |
4.103
(b) (c) “At most, two nonword errors.”