Mathematics, 25.02.2021 17:00 KallMeh

MUST ANSWER NOW Letters are sent by second class post unless they are
marked first class.
Over a long period of time it has been established that
50% of letters to be posted are marked first class.
In a random selection of 12 letters to be posted,
find the probability that the number marked first class is
(a) at least 2.
(b) fewer than 10.

Answers: 3

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MUST ANSWER NOW Letters are sent by second class post unless they are
marked first class.