3 years ago

140 tests is ___% of 160 tests

2 answers:

7 0

We set up a proportion: 140/160= ?/100

Cross multiply: 160*?= 100*140
⇒ ?= 100*140/160= 87.5

140 tests are 87.5% of 160 test.

4 0

140 tests is ___% of 160 tests.

140/160

140 ÷ 160 = 0.875

0.875 × 100 = 87.5
87.5%

140 tests is 87.5% of 160 tests.

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The percent of the items produced by machine which are not defective: $Q=1-0.1=0.9$

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$\text{S.E.}=\sqrt{\dfrac{0.1\times0.9}{100}}\\\\\Rightarrow\text{S.E.}=0.030$

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