Posted by tms on .
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%

math 
john,
SE=9.5
chance=30% 
math 
Anonymous,
and the Expected smoker #?

math 
john,
120

math 
Din123,
thanks

math 
George Lewis,
Can you give the steps that led to these answers?