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In probability and statistics , the " Irwin–Hall distribution " , named after Joseph Oscar Irwin and Philip Hall , is a probability distribution for a random variable defined as the sum of a number of independent random variables , each having a uniform distribution .
 person: Joseph Oscar Irwin; person: Philip Hall
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Joseph Oscar Irwin, Philip Hall 
Answer:
 person: Joseph Oscar Irwin; person: Philip Hall