premise: Production at Brampton’s Fiat Chrysler automobile assembly plant was at a standstill today (May 3) as a labour dispute at a parts supplier in Ajax continues. Workers at Lear Corporation went on strike April 28 after contract negotiations fell apart. About 320 workers, represented by Unifor Local 222, voted to support strike action earlier in the week and later rejected a tentative new collective agreement. The Ajax plant is a “just-in-time” seating supplier for the Fiat Chrysler plant.
hypothesis: The vast majority of workers represented by Unifor Local 222 voted to support strike action earlier in the week
reason: It's neither definitely correct nor definitely incorrect because it only says that 320 voted in favour, it doesn't say out of how many and that it was a "vast majority" only a majority