Question 998628
mean=np
variance= np(1-p)
5.2=np
3.12=np(1-p)
n=(5.2)/p
3.12=5.2/p * p * (1-p)=5.2(1-p)
3.12=5.2-5.2p
-2.08=-5.2p
p=0.4
n=13
np(1-p)=0.24*13=3.12