Question 607992
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Hi
 {{{highlight(5)}}} types killing 35%, 45%, 65%, 85%, and 90% of the Insects
choosing one at tandom
 P(&#8805; 65%) = 3/5
 P(&#8805; 45%) = 4/5
 P(40%-80%) = 2/5
If two of the insecticides are chosen at random
P(anyone of the pair &#8805; 85) = 1-not chosen = 1-{{{3/5*2/4}}}  = 1-6/20 = 14/20 = 7/10