# Search results

1. ### Normal distribution - Finding mean and standard deviation

Many thanks for the reply, and you are correct. I was using the table wrong and now understand how it all works properly. Thanks for taking the time to reply. JAmes
2. ### Normal distribution - Finding mean and standard deviation

Thanks for the reply, but I get that part. I was wondering about the values of 0.8779 and -0.5534 I think they are correct for the corresponding probabilities but the answer got different values. So it's actually the Z1 and Z2 values I need checking. After that, I'm fine. CHeers James
3. ### Normal distribution - Finding mean and standard deviation

Homework Statement A high jumper knows from experience that she can clear a height of at least 1.78m once in 5 attempts. She also knows that she can clear a height of at least 1.65m on 7 out of 10 attempts. Find to 3 dp the mean and standard deviation of the heights the jumper can reach...
4. ### Geometric Distribution Question

Cheers! I know the actualy calculation is done right. Just wasn't completly sure if I'd used the right method. I stupidly left the notes I did for the question at University and I'm revising now at home so can't check over them.
5. ### Geometric Distribution Question

Homework Statement An experiment consistion of tossing three fair coins is performed repeatedly and "success" is when all three show a head. What is the probability that the success is on the third performance of the experiment? Homework Equations Geometric distribution equation p(x) =...