Dorothy Little purchased a mailing list of 2,000 names and addresses for her mail order business, but after scanning the list she doubts the authenticity of the list. She randomly selects five names from the list for validation. If 40% of the names on the list are non-authentic, and x is the number on non-authentic names in her sample, the expected (mean) value of x is ___.
A) 2.50
B) 2.00
C) 1.50
D) 1.25
E) 1.35

Question

Quizplus · Accepted Answer

The expected value is calculated as the probability of a name being non-authentic (0.40) multiplied by the sample size (5), which equals 2.00.

Dorothy Little Purchased a Mailing List of 2,000 Names and Addresses