According to Transparency International, $\_\_\_\_\_\_\_\_\_\_\_$ have a Corruption Index below $\_\_\_($out of $100).$

Group of answer choices

$(1)/(2)$ of countries, $50$

$(1)/(2)$ of countries, $55$

$(1)/(2)$ of countries, $40$

$2/3$rds of countries, $50$

$2/3$rds of countries, $40$