what is the probability that at least 1 of the 11 buyers will get a defective e-reader?

Question

An electronics store receives a shipment of 26 e-readers. Unbeknownst to the store, 5 of the e-readers are defective. If the store sells 11 of these e-readers the first day, what is the probability that at least 1 of the 11 buyers will get a defective e-reader? (Round your answer to three decimal places.)

Answer 1

Answer 2

26

5 defective

11 sold

what is the probability that at least one of the 11 sold is defective?

1 minus the probability none are defective=

1-(21/26)(20/25)(19/24)(18/23)(17/22)(16/21)(15/20)(14/19)(13/18)(12/17)(11/16)

=1- .04565

=0.95435= 95.435% probability at least one defective