Question

Out of 1,100 discs tested, 13 are defective. Estimate the number of defective discs in a batch of 41,000

Answer 1

Set up simple proportions to estimate this!\[\frac{ 13 }{ 1100 }=\frac{ x }{ 41000 }\]You then cross-multiply to get 1100x = 533,000.
Dividing by 1100 on both sides yields:
x = 484.55, but you can't have partial disks. So you would round up here and say approximately 485 defective disks.

Answer 2

i already have the answer it's a.485

Answer 3

In how many ways could you choose two different letters from the letters C, O, U, N, T