NO.PZ2022071202000062
问题如下:
Question An analyst determines that 60% of all US pension funds hold hedge funds. In evaluating this probability, a random sample of 10 US pension funds is taken. Using the binomial probability function, the probability that exactly 6 of the 10 firms in the sample hold hedge funds is closest to:选项:
A.60.0%. B.11.2%. C.25.1%.解释:
SolutionC is correct. The number of trials is 10 (n), the number of successes is 6 (x), and the probability of success is 0.60 (p). By using the formula:
and the values given,
A is incorrect. It is the given chance of success, 60%.
B is incorrect. It uses a probability of 0.40 instead than 0.60:
我的计算方式是0.6的6次方*0.4的4次方