In a certain population, the distribution of blood types is as follows: 42% of the individuals are of group O, 45% of group A, 9% of group B and 4% of group AB. By randomly selecting a sample of 120 blood donors, it was found that 60 were group O, 49 group A, 9 group B and 2 group AB. We want to test if the distribution of blood groups among the blood donors is the same as in the population. What is the calculated ?2 value required to perform this hypothesis test?

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