Thanks: QuIcK and sorobon, btw value for QuIcK is as follows,

The problem can be perceived by in both the ways. First one, finding the probability of those assumed(here the defective proportion are assumed) parts(A and B) are not defective. [and] second one, the probability that those assumed parts WILL not be defective , i mean the probability of the respective defective parts not equalling their assumption(here 8/100 and 6/100).

For the second possibility, i think we should make use of hypothesis and compute standard error(sqrt(pq/n)), here (sqrt(.08*.92/100)) and finding z (normal probability distribution). If Z ie .(assumed proportion-experimenting proportion)/standard error) is > or = 1.96 then the assumption is rejected and viceversa. Atleast one which proves the defective proportion is more or less than the assumed one, we can conclude those assumed ones are wrong, and their probability is a no of favourable trial to no of possibilities (100). For the experimenting proportion, it is just the ramdom number from 1 to 100 other than 8 in the first case.

However, i got headache in proving by the second method.

Guys thanks for the problem, solved in a simple way.

For the QuIcK value,

the value gets reduced to 512000*c/(L*o)

if c = correctness in percentage

L = reciprocal of Labourious in percentage

o = objectivity in percentage.

QuIcK = 512000*(.95)/(1.25*.95)

=409000

=409K

Proficiency = 409/512 * 100

= 80%

Thanks.