In a population of 10,000 adults, 20% are smokers. A simple random sample of 600 of the adults is drawn.

a)The SE of the number of smokers in the sample is closest to

9.45
9.5
9.55
9.6
9.65
9.7
9.75
9.8
9.85
9.9

b)The chance that there are fewer than 115 smokers in the sample is closest to (pick the best of the options below, even if you can calculate the probability more accurately)

10%
20%
30%
40%
50%
60%
70%
80%
90%

5 answers

SE=9.5
chance=30%
and the Expected smoker #?
120
thanks
Can you give the steps that led to these answers?