What is the probability that 2 or more of these t-shirts are irregular?

Geschrieben von T-Shirt Redaktion 2 Februar, 2009 (2) Comment
T-Shirts
Billy_Bob fragt:

A t-shirt manufacturing company advertises to its retailers that the probability of an individual t-shirt being first quality is 95%. A box of 15 such t-shirts is selected for inspection. What is the probability that 2 or more of these t-shirts are irregular?

I need some help with this problem.[/trans]

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