AMS employs 8 professors on their staff. Their respective probability of remaining in employment for 10 years are 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9. The probability that after 10 years at least 8 of them still work in AMS is ? Choose the correct choice from the following answers:
A) 0.19
B) 1.22
C) 0.00363.
D) 0.16
E) none of these
Asking atleast 6 of them continue ,   it has 3 cases.   1 all 8 professors continue.   1st case all 8 continue is = 2/10*3/10*4/10*5/10*6/10*7/10*/8/10*9/10=   =&gt;0.00363.   0.00363.
<result>C</result>
AMS employs 8 professors on their staff. Their respective probability of remaining in employment for 10 years are 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9. The probability that after 10 years at least 8 of them still work in AMS is ?