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A 9-1-1 emergency call centre's records show that 1 out of every 5 calls placed to the centre were dialed in error. If the supervisor

A 9-1-1 emergency call centre's records show that 1 out of every 5 calls placed to the centre were dialed in error. If the supervisor randomly checks twenty calls from the records, determine the probability that less than three calls were placed in error.

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