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# S1 normal distribution question watch

1. Can someone help with part (b) please, I don't know what to do
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2. (Original post by mica-lwe)
Can someone help with part (b) please, I don't know what to do
What does it mean for 85% of the first bounces to exceed a certain height? Where would this height roughly be on a normal distribution graph? Can you match it to a z value?
3. (Original post by SeanFM)
What does it mean for 85% of the first bounces to exceed a certain height? Where would this height roughly be on a normal distribution graph? Can you match it to a z value?
I've used inverse normal, put my values in and got 137.4, what notation do I use for this? All I have is a diagram and =137.4 on my page...
4. (Original post by mica-lwe)
I've used inverse normal, put my values in and got 137.4, what notation do I use for this? All I have is a diagram and =137.4 on my page...
You can do it then

You may wish to call the height H and say that P(X>H) = 0.85.

Then turn that H into a Z value, get rid of the probability sign on the left by picking the right z value that matches p(Z>z) = 0.85, and go on from there.
5. Thankyou!

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