2009 Level 1 Sample Exam Version 2
Question #12 out of 60
An analyst has recently determined that only 60 percent of all U.S. pension funds have holdings in hedge funds. In evaluationg this probability, a random sample of 50 U.S. pension funds is taken. The number of U.S. pension funds in the sample of 50 that have hedge funds in theor portfolio would most accurately be described as a:
A. binomimal random variable
B. Bernouli random variable
C. continuous random variable

答案给的是A，但是解释的原因又像是B
答案的解释： This is a Bernuouli trail because a U.S. pension fund either has investment in hedge funds or it does not; i.e., the experiment must have one of two outcomes. A binomial random variable is defined as the number of success in n Bernouli trials
我觉得按照这个解释 就应该选B 但是答案给的还是A 所以我就很费解