diff --git a/api/index.php b/api/index.php
index 6997a41..c063c0b 100644
--- a/api/index.php
+++ b/api/index.php
@@ -90,7 +90,7 @@ function array_standard_deviation($array) {
     $variance += pow(($i - $mean), 2);
   }
 
-  return round(sqrt($variance / $count), 1);
+  return round(sqrt($variance / $count), 2);
 }
 
 /**