Plugin nos.
Let people surveyed be 100
10% of 100 surveyed do not respond=10
90 surveyed responded=the required no response for the survey to be valid.
Double is 180.
To get 180 you need 200 responders.
Plugin in n=90 and p=10 in the given expression.
1) Start from C
\(\frac{200n}{p}\)
\(\frac{200*90}{10}\) =1800=wrong.
2) Pick A (I checked all the answer choice but for sake of time and effort showing only 2 workings)
\(\frac{200*n}{100-p}\)
\(\frac{200*90}{100-10}\) 200=correct.
...
Let people surveyed be 100
10% of 100 surveyed do not respond=10
90 surveyed responded=the required no response for the survey to be valid.
Double is 180.
To get 180 you need 200 responders.
Plugin in n=90 and p=10 in the given expression.
1) Start from C
\(\frac{200n}{p}\)
\(\frac{200*90}{10}\) =1800=wrong.
2) Pick A (I checked all the answer choice but for sake of time and effort showing only 2 workings)
\(\frac{200*n}{100-p}\)
\(\frac{200*90}{100-10}\) 200=correct.
...
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