Ans:
a)
sample size,n=64
standard deviation=800
standard error of mean=800/sqrt(64)=100
z=+/-100/100=+/-1
P(-1<z<1)=P(z<1)-P(z<-1)
=0.8413-0.1587=0.6826
b)If n increases,the probability that sample mean falls within 100 acres of the population mean will increase,as standard error will decrease.
7) To estimate the mean acreage of ranches in a certain province a resear cher plans...