Vladimir

for (var i = 0; i < coords.length; i++) {
   myCollection.add(new ymaps.Placemark(coords[i]), {
       balloonContentBody: bools[i]
   });
}

for (var i = 0; i < coords.length; i++) {
   myCollection.add(new ymaps.Placemark(coords[i], {
       balloonContentBody: bools[i]
   }));
}