Assume that the finishing times in NYC 10-kilometer road race are normally distributed with a mean if 61 minutes and a standard deviation of 9 minutes. Let X be a randomly selected finishing time. Find a) P(X72) b) P(52

Question

Assume that the finishing times in NYC 10-kilometer road race are normally distributed with a mean if 61 minutes and a standard deviation of 9 minutes. Let X be a randomly selected finishing time. Find 
a) P(X>72)
b) P(52<X<70)
c) Find P95 ( the 95 percentile point)

hac138 · Answer

b

hac138 · Answer

GO TO MY QUESTION ABOVE THIS ONE

evoker · Answer

You will need to calculate z values and use a z table

addytea · Answer

How do I calculate z values? @evoker

faiqraees · Answer

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faiqraees · Answer

This is called a z-table? Do you know how to use them?

addytea · Answer

I do. I'm just looking for the answer lol For a I got 0.11507. For b I got 0.8 and c. Is a lost cause @faiqraees

faiqraees · Answer

Can you show your working for both a and b because I am getting different answers?