If on an average 9 mountain climbers out of 10 return safely, what is the probability that with 5 climbers…

If on an average 9 mountain climbers out of 10 return safely, what is the probability that with 5 climbers out, at least 4 will return safely?
  1. 95×750000
  2. 94×750000
  3. 95100000
  4. 94×350000

Solution

P(returning safely)=910

P(at least 4 returning safely)+P(5 returning safely)

=C45·9104·1101+C55·9105

=5·94105+95105

=94(14)105

=94·750000

Asked in: AP EAMCET 2020 (23 Sep Shift 1)

Practice more Probability questions on Aicharya