Question

For a sample size of 140 and a sample proportion of 0.3, what is the standard deviation of the normal curve that can be used to approximate the binomial probability histogram? Round your answer to three decimal places.

A. 0.045
B. 0.039
C. 0.053
D. 0.064

Answer 1

$$ \Large
standard~deviation=\sqrt{
\frac {p(1-p)} {n} }


$$

Answer 2

what is p and n (140 or 0.3)

Answer 3

p is proportion .3
n is 140

Answer 4

ok I got 0.0387 or 0.039 rounded which would be B. thanks for your help :)