Question 469617
13)
p=.05, q=.95 n=1900
{{{mu=np=1900*.05=95}}}
{{{sigma=sqrt(npq)=sqrt(1900*.05*.95)=9.5}}}
P(0<= x <= 85.5)
{{{z=(x-mu)/sigma=(85.5-95)/9.5=-1
Area under the normal curve is .1587
.
Ed