if class time is evenly distributed between 47 and 57 minutes, what is the probability that a given class is longer than 51.75 minutes

Question

anonymous · Answer

I believe you use this:
 z=x−μ 
______
     σ

μ=Mean
σ=standard deviation 
z= z score

anonymous · Answer

It is Standard Normal Distribution... I can't figure out how to find the graph hight...

anteater · Answer

I may be wrong on this, but if it is uniformly distributed, would it simply be (57 - 51.75)/(57-47) ?

anteater · Answer

anteater · Answer

My interpretation would be that by "evenly distributed" they mean "uniform distribution".