When circ_uit bo_ards used in the manufac_ture of compact disc players are tested, the long-run percentage  of defectiv_es is abo_ut 5%. Suppose that a batch of 250 boards has been received and that the condition  of any particular boards is inde_pend_ent of that any other board.  What is the (approximate) prob that more than 10% of the boar_ds in this bat_ch are defective?  What is the (approximate) prob that there are exactly 10 defec_tives in this batch

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