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4. 5%. N1 = 40 /, N2 100 /., N = 10 /.
. = N/N. = 4, =10. = 4, =3 ( ). , = 3 5% , n=450. , t = n / N; t =450/10=45 . n = 1800 , N 1=40 /, t1 = 1800/40=45 .
=10. t = 20/10 = 2 , t2 = 650/100=6,5 7 .
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