jinx_58
Hey jinx_58 again,
I used a different graphics calculator to you when I did it so I wouldn't be able to tell you the specific buttons but you should be able to get that info off your calculator manual or online. With a scientific calculator all you have to do for question 6 is 8C6(0.86)(0.22) + 8C7(0.87)(0.21) + 8C8(0.87)(0.20) which should give around 0.797.
As for question 9, for our graphic calculator, we just went to the graphing function then graphed both of those functions then we had an option to find the intercept of it so it was easy as that. Worst-case scenario, you use the graphics calculator to equate both functions and solve for x.
Hope that helped.
- PP