X~B( 20??? ,0.1)
i) P(X=3) = 20C3 * (0.1)^3 * (0.9)^17
ii) P(X less that or equal to 2)=
use the tables
iii) 0.1 * 20 =
iv)Ho : p= 0.1 H1 : p<0.1v) there would be no critical region for that value of 20. 20 is too small. 12.16 % would have to be the significance levelvi) X~B (65,0.1)2 people use the pin 1234P(X less than or equal to 2)= 0.0531 > 5 percent Accept the Ho. There's insuffient evidence to suggest number of people using 1234 as PIN lowered.anyone want to add to this?