<prompt> Translate the following text to EnglishWTPs za mtu binafsi kwa kupunguzwa kidogo kwa hatari ya vifo huongezwa kwa watu wa kutosha kugundua thamani ya maisha ya kihistoria yaliyookolewa.  <response>: Individual WTPs for small reductions in mortality risk are summed over enough individuals to infer the value of a statistical life saved. 