NO.PZ2019012201000029
问题如下：
TMT has $300 million in assets under management, an active risk of 5.5%, an information coefficient of 0.10, and a transfer coefficient of 0.6. TMT’s portfolio has a 3% expected active return this year. The number of truly independent decisions TMT would need to make in order to earn the expected active portfolio return is closest to:
选项：
A.83.
B.55.
C.61.
解释：
A is correct.
考点：Building Blocks
解析：根据如下公式，独立决策的个数等于:
E (RA) = IC × √BR × σRA × TC
E (RA) = 0.10 × √BR × 5.5% × 0.6 = 3%
3% = 0.10 × √BR × 5.5% × 0.6
BR = 82.64 约等于83
E (RA) = IC × √BR × σRA × TC
E (RA) = 0.10 × √BR × 5.5% × 0.6 = 3%
3% = 0.10 × √BR × 5.5% × 0.6
BR = 82.64 约等于83
√BR =3%/（0.1*0.6*5.5%）=0.03/0.0033=9
我算出来的√BR 怎么等于9呢。。。开根号大概是3
是哪算错了么
