Speed and Accuracy Flashcards

A data entry clerk processes 120 records per hour with a 2% error rate. How many errors would be expected in a 7.5-hour shift?

Answer: 18

Total records: 120 x 7.5 = 900. Errors: 900 x 0.02 = 18 errors expected in the shift.

A code has the format: 2 letters followed by 4 digits followed by 1 letter (e.g., AB1234C). Which of the following is correctly formatted?

Answer: GH5678J

The format requires exactly 2 letters, 4 digits, then 1 letter (7 characters total). GH5678J matches: GH (2 letters) + 5678 (4 digits) + J (1 letter). ABC1234D has 3 initial letters, AB12345C has 5 digits, and A12345BC has 1 initial letter.

Given the sequence: 3, 7, 15, 31, 63, what is the next number?

Answer: 127

Each number is double the previous number plus 1: 3x2+1=7, 7x2+1=15, 15x2+1=31, 31x2+1=63, 63x2+1=127. Alternatively, each term is 2^n - 1: 4-1=3, 8-1=7, 16-1=15, 32-1=31, 64-1=63, 128-1=127.

In a list of patient reference numbers, which one does NOT follow the pattern XX-NNNN-X (where X is a letter and N is a digit)?

Answer: GH-901-J

The pattern requires exactly 4 digits in the middle section. GH-901-J only has 3 digits (901), which does not match the XX-NNNN-X pattern. All others have exactly 4 digits in the middle.

A typist types at 65 words per minute with 98% accuracy. In a 500-word document, approximately how many words will contain errors?

Answer: 10

With 98% accuracy, 2% of words will contain errors. 500 x 0.02 = 10 words with errors.

Which number in this series does not belong: 2, 4, 8, 16, 24, 64?

Answer: 24

The series should double each time: 2, 4, 8, 16, 32, 64. The number 24 breaks the pattern — it should be 32 (16 x 2 = 32, not 24).