Question 1158650
exactly 3 defective is 10C3*0.05^3*0.95^7=0.0105 

at most 3 includes the above plus 0,1,2
for 2 it is 10C2*0.05^2*0.95^8=0.0746
for 1 it is 10*.95^9*0.05=0.3151
for 0 it is 0.95^10=0.5987 
the sum is 0.9989, which is the answer