The probability that a person has immunity to a particular disease is 0.3. Find the mean and standard deviation for the random variable x, the number of people who have immunity in samples of size 28.
This is a binomial distribution.
mean= 28*.3
standard deviation= sqrt (28*.3(1-.3))
http://www.stat.yale.edu/Courses/1997-98/101/binom.htm
This is a binomial distribution.
mean= 28*.3
standard deviation= sqrt (28*.3(1-.3))
http://www.stat.yale.edu/Courses/1997-98/101/binom.htm
ok got it
thanks